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Evaluation of Feeding, Eating, and
Swallowing for Children With Cerebral
Palsy
Kate Barlow, OT, OTD, OTR
Assistant Professor of American International College
Springfield, MA
Kelsey Sullivan, OTS
Occupational therapy student at MGH Institute of Health Professions
Boston, MA
This CE Article was developed in collaboration with AOTA’s Children & Youth
Special Interest Section
ABSTRACT
Most children with cerebral palsy (CP) also have a pediatric
feeding disorder (PFD). Evaluating feeding in children with CP is
a highly complex process that is best done in a team environment.
This article describes the prevalence of PFDs in children with CP
and highlights the special clinical considerations of the occupa-
tional therapist in evaluating PFDs in children with CP.
LEARNING OBJECTIVES
After reading this article, you should be able to:
1. Identify the elements of PFDs resulting from CP that require
special consideration
2. Identify the typical phases of swallowing and the impact of CP
3. Describe the role of the occupational therapist in assessing
each phase of swallow for children with CP.
INTRODUCTION
Eating and swallowing are ADLs that individuals learn to master
to independently function and take care of themselves (American
Occupational Therapy Association [AOTA], 2020). Impairment in
ones ability to properly and safely complete necessary ADLs may
lead to a decreased perception of their quality of life (QoL) (Ede-
mekong et al., 2020). When a child is born, they must rely on
caregivers to complete basic ADLs; however, as they grow, chil-
dren learn to complete these tasks for themselves. The motivation
to do so is linked to an innate feeling of competence and satis-
faction when successfully completed independently (Shepherd
& Ivey, 2020). When a child is born with a disability, the capacity
to perform certain ADLs may be impaired, thus interfering with
feelings of autonomy, self-esteem, and self-determination (Shep-
herd & Ivey, 2020).
Children born with cerebral palsy (CP), the most com-
monly diagnosed motor disability in children, have “motor,
cognitive, and perceptive impairments” that affect their ability
to complete many ADLs (Erasmus et al., 2012, p. 409). Of
importance, several studies suggest that children with CP have
a particular difficulty in completing various tasks associated
with feeding. Dysphagia, the impaired ability to swallow, is
prevalent in more than half of all children with CP and is the
“leading cause of death in individuals with CP” (Novak et al.,
2020, p. 10). Additionally, children with CP are chronically
classified as malnourished for reasons that include oral motor
dysfunction, chewing disorders, and postural abnormalities
(Inal et al., 2017).
The complexity of CP cases with comorbid conditions, par-
ticularly feeding disorders, requires a qualified team approach
when evaluating and treating for various impairments during
both volitional and reflexive phases of feeding and swallow-
ing. The purpose of this article is to highlight the prevalence
of feeding disorders in children with CP, and the role of the
occupational therapist (OT) in evaluating children with CP
who have feeding difficulties. Evidence-based evaluation and
treatment considerations for this specific population will be
reviewed.
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PREVALENCE OF CP IN THE UNITED STATES AND GLOBALLY
CP is the most common pediatric motor disability in the United
States, affecting approximately 2 per 1,000 live births, or
around 10,000 births a year (Poinsett, 2020). Furthermore, it is
estimated that more than 750,000 children and adults have this
motor disability. Globally, there are approximately 50 million
individuals living with CP who require rehabilitation services
(Cieza et al., 2020).
Although CP is the most commonly diagnosed motor
condition in children, its exact cause has not been identi-
fied (Cerebral Palsy Alliance, 2015). Research has identified
several risk factors associated with high rates of children with
CP, including low birthweight and premature birth, multiple
pregnancies, and maternal infection (Reidy et al., 2020).
Additionally, higher rates of CP are diagnosed in males and
non-Hispanic black children (Stavsky et al., 2017). A child
with CP is diagnosed according to one of four main types,
including spastic (80% to 86% of cases), dyskinetic, ataxic, or
mixed (Stamer, 2016). Hallmark symptoms depend on type,
but they commonly include reduced gross motor skills, poor
postural control, and abnormal muscle tone, which all affect
function (Labaf et al., 2015).
Although not considered hallmark features of the con-
dition, feeding difficulties affect 70% to 80% of children
with CP (Korth & Rendell, 2015). Additionally, drooling and
swallowing difficulties were estimated to affect 44% and 50%
of individuals with CP, respectively. Individuals with more
severe forms of CP and increased impairment in functioning
were found to have a higher prevalence of feeding problems.
Furthermore, those who had difficulties with feeding showed
increased rates of malnutrition and aspiration pneumonia, and
an overall decrease in QoL.
PEDIATRIC FEEDING DISORDERS
Pediatric feeding disorders (PFDs) affect up to 29% of all children
in the United States (Silverman et al., 2020). Despite the preva-
lence of such conditions, there is a lack of awareness and univer-
sally accepted definition for PFDs. With influence from the World
Health Organizations International Classification of Functioning,
Disability and Health, the following definition is proposed: PFDs
are “impaired oral intake that is not age appropriate and associ-
ated with medical, nutritional, feeding skill, and/or psychosocial
dysfunction” (Goday et al., 2019, p. 124). With this definition in
mind, PFDs are clearly complex in nature and require a holistic
and collaborative approach to evaluation and treatment.
PFDs may encompass one or more impairments within the
domains of medical, nutritional, feeding skills, and/or psy-
chosocial dysfunction, thus requiring the child’s physician to
obtain further information from a range of medical specialists,
including, but not limited to, an allergist, dentist, gastroenter-
ologist, dietician, psychologist, speech-language pathologist
(SLP), and OT (Marcus & Breton, 2013). These specialists aid
in the comprehensive evaluation process and perform tests to
assess feeding and swallowing ability, along with the potential
for comorbid conditions.
When addressing the nutritional needs and potential dys-
function of this area, a registered dietitian (RD) is often needed.
An RD will assess whether a child is obtaining the necessary
calories, fluids, and other vital nutrients for optimal growth and
functioning, as well as recommend a modified diet when appro-
priate (Marcus & Breton, 2013). This specialist has expertise
in creating a well rounded and tolerated diet for the child and
works collaboratively with SLPs and OTs for effective feeding
skill development.
The role of OTs in pediatric feeding will be further discussed
in detail in the following section; however, they play a crucial
role, along with SLPs, in aiding a child with CP to properly
develop the necessary skills to feed successfully.
Last, psychosocial dysfunction may present not only in the
child with a PFD, but also in the parents, caregivers, and family
members who tend to the child. A psychologist or psychiatrist
may evaluate the child and caregivers’ mealtime behaviors to
identify strategies to increase positive feeding experiences and
strengthen the parent–child relationship (Marcus & Breton,
2013). Each professional brings their valuable expertise to the
team, but the focus must remain on the child and caregiver,
to provide family-focused care in a collaborative treatment
approach because of the complex and multi-contextual nature
of PFDs.
OCCUPATIONAL THERAPY’S ROLE IN PEDIATRIC FEEDING
Occupational therapy practitioners (OTPs) are specifically
trained to enable and increase participation in ADLs, including
feeding, eating, and swallowing (AOTA, 2017b). Furthermore,
OTPs “have the education, knowledge, and skills necessary for
the evaluation of and intervention with feeding, eating, and
swallowing problems” (AOTA, 2017b, p. 1). The lifespan focus
of occupational therapy enables practitioners to provide care to
the youngest of patients and their caregivers, starting at breast
and/or bottle feedings. As an infant grows, the OTs extensive
knowledge of developmental milestones allows them to aid in
the transition to complementary and solid foods and liquids
when appropriate (AOTA, 2017b).
If a child is suspected of having difficulty swallowing or
aspirating, a modified barium swallow study (MBSS), also
referred to as a videofluroscopic swallow study (VFSS), may be
ordered. An MBSS/VFSS examines the “physiological function
of the swallowing mechanism” (Martin-Harris et al., 2020, p.
1079). During the swallow study examination, a child consumes
solids and liquids of varying consistencies coated or mixed
with barium sulfate for contrast while imaging. As a result,
physicians and feeding therapists are able to visualize swallow-
ing physiology to determine adequate function. The swallow
study is able to reveal lip closure, chewing (mastication), bolus
propulsion, tongue and epiglottis movement, and the path of
liquids and solids from the oral cavity to the esophagus—or in
the case of aspiration, to the larynx (Martin-Harris et al., 2020).
While working in an interprofessional team, both OTs and SLPs
with proper training can perform portions of this test (Paul &
D’Amico, 2013).
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Occupational therapy practioners are well equipped to pro-
vide care to pediatric patients and their caregivers at any point
in the therapeutic process. According to AOTA (2017b), “Practi-
tioners develop clinical reasoning skills to consider the interplay
of physical, cognitive, emotional, environmental, and sociocul-
tural factors in providing effective services for feeding, eating,
and swallowing dysfunction” (p. 2). The multi-contextual nature
of PFDs emphasizes the strength OTs possess to incorporate the
aforementioned factors into treatment. Furthermore, this client-
and family-centered practice requires practitioners to provide
care not only to the child, but also to the caregiver, specifically
in relation to the resulting stress from a child with a PFD.
In a study conducted to understand the effect of PFDs on
caregivers and daily activities, including social participation,
the researchers concluded that family-centered and occupa-
tion-based treatments improve the overall QoL for both the
child and their families (Simione et al., 2020). This further
supports the vital role Occupational therapy practioners have in
treating and educating caregiver(s) and children with feeding
disorders (Paul & DAmico, 2013).
Incorporating meaningful and occupation-based treatments
is an important part of the OTs role in caring for children
with feeding disorders. OTs work to create safe, functional
feeding habits and routines to increase the child’s ability to
participate in mealtimes. In a systematic review conducted
by Howe and Wang (2013), interventions commonly imple-
mented by OTs include behavioral, parent-directed and
educational, and physiological. Children receiving behavioral
interventions (e.g., differential attention, shaping, fading,
escape extinction) increased food variety, mealtime behaviors,
and self-feeding skills. Studies reviewing the effectiveness of
education and relationship-based interventions (i.e., providing
caregivers with information and recommendations relating to
their child’s feeding difficulties) produced improvements in a
child’s physical growth and development, as well as child and
caregiver feeding competence.
Physiological interventions focused on the complexity of
the developmentally acquired actions necessary for successful
feeding: breathing, sucking, and swallowing. Interventions for
this approach included preparatory behaviors (e.g., nonnu-
tritive sucking, skin-to-skin contact), feeding skills (e.g., oral
stimulation to elicit sucking and swallowing), and environ-
mental supports (e.g., positioning devices and modified equip-
ment such as a slow-flow nipple) (Howe & Wang, 2013).
The OT is also responsible for assessing and treating oral-sen-
sory issues. Occupational therapy’s unique understanding of the
sensory system allows for developing strategies to increase the
acceptance of food textures (Feeding Matters, n.d.). Occupa-
tional therapy’s educational background equips practitioners
with the tools necessary to treat such conditions, including
“neuroscience, anatomy, and activity/environmental analysis
to identify and treat occupational performance issues result-
ing from sensory modulation, sensory integration, motor, and
psychosocial deficits” (AOTA, 2017a, p. 2). The Sequential Oral
Sensory approach to feeding is an example of an evidence-based
intervention that supports childrens exploration of food
through play, which leads to an increase in food acceptance
(Toomey & Ross, 2013).
Occupational therapy’s scope of practice includes knowledge
on the use of low- and high-tech assistive devices (AOTA,
2015). An assistive technology device is defined under the
Individuals with Disabilities Act of 1988 as “any item, piece
of equipment, or product system, whether acquired commer-
cially off the shelf, modified, or customized, that is used to
increase, maintain, or improve functional capabilities of indi-
viduals with disabilities” (AOTA, 2010, p. S46). Due to man-
ifestation of CP, marked by a lack of volitional control over
movements, positional devices are used to improve physical
stabilization of the child, particularly by providing support for
optimal alignment at key points of control, including the feet,
knees, hips, trunk, and head (Hulme et al., 1987; Lino et al.,
2020). Positional devices, also referred to as adaptive seating
devices, maintain head and trunk in an upright, vertical plane.
Position hips at greater than 90° of flexion to prevent posterior
pelvic tilt and pelvic thrust.
An example of an assistive device includes placing a small
towel under a child’s knees to increase the hip flexion (Hurley,
2012). Below the waist, positional devices maintain knees in 90°
of flexion and ankles in neutral, and support bilateral feet place-
ment (Hulme et al., 1987). Using positional devices for chil-
dren with spastic, hypotonic, or mixed tone not only improved
sitting posture, but also increased the ability to maintain food in
the oral cavity and consume foods of enlarged texture (puree/
blended to chopped/cut up) (Hulme et al., 1987).
Adaptive equipment (AE) frequently prescribed by OTs for
clients with CP is found to improve participation in daily life
activities, including components of feeding such as using a cup
or cutlery (Lino et al., 2020). Adaptive feeding equipment may
include cups with lids and straws of differing sizes, heights, and
materials. Lino and colleagues (2020) concluded that using such
adaptive cups increases independence in task completion, as
the equipment enables a child with CP who has limited upper
extremity control to drink independently.
AE to improve using cutlery improved independence in
the task. Equipment used during interventions included
angled-handled spoons, neoprene orthoses, and foam-grip
tubing (Lino et al., 2020). Overall, positional devices and AE
may be used alone or in combination to increase muscle tone,
posture, trunk control, fine motor skills, and coordination
(Feeding Matters, n.d.).
ASSESSMENT
The most difficult part of the assessment process is evalu-
ating oral motor skills and swallowing function. To date, there
is not a comprehensive feeding and swallowing standardized
assessment that includes all the complex areas of feeding, espe-
cially oral motor skills (Korth & Maune, 2020). Considering the
phases of swallow and the four domains of PFDs is one system-
atic approach to observing and evaluating the process of eating
and swallowing.
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PHASES OF SWALLOW
Swallowing is defined by the three phases of swallow: oral,
pharyngeal, and esophageal (Marcus & Brenton, 2013; Ross,
2012; VitalStim Therapy, 2015). In some literature, the oral
phase is divided into two: an anticipatory or oral prep phase,
and an oral phase (Korth & Maune, 2020). Another way to view
the phases of swallow is through the voluntary phases (antic-
ipatory and oral) and the involuntary phases (pharyngeal and
esophageal) (DINES, 2019). Each phase of swallow has a neural
component, resulting in the high prevalence of children with CP
with dysphagia (Bashar et al., 2015).
In the anticipatory, or oral prep phase, the sensory
variables of the environment are considered, the food is
introduced, the lips close, and a bolus is formed. Phase one
intervention considerations for the OT include evaluating
hunger, the environment, positioning, hand-to-mouth coordi-
nation, size of the bite, sensory concerns, AE, and behaviors;
as well as improving the quality of chewing through improved
oral motor skills of the lips, jaw, cheeks, and tongue. Approx-
imately 80% of parents of children with CP report their child
as having difficulty with chewing, and these children often
have difficulty with the transition to solid food (Aggarwal et
al., 2015).
Regardless of whether a child has a disability, children who
do not properly master oral motor milestones will have diffi-
culty chewing and are at an increased risk for negative feeding
experiences. Children under the age of 4 years are still devel-
oping the correct oral motor patterns and coordination needed
to safely and correctly chew typical foods. In addition, chewing
is considered a learned behavior (Brackett, 2016). A child first
learns to suck on a nipple to receive food; if a child is given solid
food too early, they will simply just suck on the solid food. A
child must be taught to chew and practice these skills. Without
proper practice, a child is not able to properly break down the
food, increasing their risk of choking.
For children with CP, maintaining proper positioning can
also be problematic. Swallowing muscles work best in their
neutral position, and poor posture can lead to decreased tone.
The child should be properly positioned with hips, knees, and
ankles at 90°, and head and neck in neutral to facilitate optimal
conditions. An example of the dangers of poor position is neck
hyperextension, which increases the risk of aspiration (Aggarwal
et al., 2015). Another important factor is the internal motivation
of the child; the food must be appealing for the child to success-
fully engage in the task (DINES, 2019).
Phase two is the oral phase, which is also under voluntary
control, and is marked by the bolus propulsion into the pharynx
by the tongue lifting against the hard palate (Korth & Rendell,
2015). Phase two interventions all target oral motor skills, such
as tongue movements for retraction and lateralization and
cheek strength (buccinators) to keep the food on the teeth and
eliminate pocketing (narrowing of the cavity creates positive
pressure).
Another key factor is making sure the mouth is closed. Lip
closure is often a problem for children with severe disabil-
ities and decreases the force of the bolus propulsion. “Lip
seal, which is also a component of lip closure, is a predictor
of drooling,” which is also an area of concern for approxi-
mately 40% of children with CP (Reid et al., 2012, p. 1035).
Strengthening the orbicularis and buccinator muscles will
improve lip closure, as they act as a sling with the upper
pharyngeal constrictor to create the positive pressure needed
for bolus propulsion (VitalStim Therapy, 2015). The tongue
must also have the appropriate range of motion and strength
to push against the posterior pharyngeal wall with enough
power to create the positive pressure needed for bolus pro-
pulsion. Observations of the oral phases include watching to
ensure there is no spillage, pocketing, or nasal regurgitation,
with the bolus propelled successfully in a single swallow
(VitalStim Therapy, 2015).
Phase three is the pharyngeal phase, which begins the
involuntary phases of swallow. Phase three begins with the
initial swallow followed by hyolaryngeal excursion; the phase
ends with the opening of the upper esophageal sphincter (UES)
(Korth & Rendell, 2015). OTs must observe for signs and symp-
toms of aspiration, which can occur during this phase. VFSSs
have indicated that children with CP have “pulmonary aspi-
ration in 38% to over 70% of the cases” (Erasmus et al., 2012,
p. 412). A slow-moving bolus, which is a pressure-generation
problem, can increases the risk of aspiration (DINES, 2019). The
“longer it takes for the swallowing reflex to trigger, the greater
the chance of aspirating food, as the airway remains open and
unprotected” (Lagos-Guimarães et al., 2016, p. 136).
In addition to a VFSS, which is the most recommended
assessment for aspiration in children (Lagos-Guimarães et al.,
2016), therapists can take several objective measures to deter-
mine whether aspiration is occurring, such as using a pulse
oximeter to monitor oxygen saturation (Smith et al., 2000),
taking temperatures (Karagiannis et al., 2011), and performing
cervical auscultation (Frakking et al., 2019). Although none
of these alternative measures is a standalone assessment, they
offer critical information that may assist other observations,
such as coughing, watery eyes, and irritability during mealtimes.
Observations of coughing is critical, as this is always indicative
that a child is in distress (DINES, 2019). Children under 3
years and children with CP are at an increased risk for choking
during mealtimes. Using the fingernail of the child’s fifth digit
as a guide to bite size is recommended to help reduce choking
(Cichero et al., 2017).
The fourth phase of swallow is the esophageal phase, which
begins and ends with the bolus entering the UES (also known as
the pharyngoesophageal sphincter in adult practice) and leaving
through the lower esophageal sphincter (LES). The opening of
the UES relies on the movement sensation of the hyolaryngeal
excursion and the pharyngeal shortening (DINES, 2019). Both
of these motor movements are involuntary with a neurological
component; therefore, opening the UES can be problematic for
children with neurological disorders. Gastroesophageal reflux
(GER) occurs with unwanted opening or relaxation of the LES.
GER is estimated to occur in approximately half of children
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with CP (Erasmus et al., 2012). Although some researchers have
reported the prevalence to be as high as 77% in children with
CP, contributing factors include the frequency of supine posi-
tioning and scoliosis, which can cause the LES to stretch (Fer-
nando & Goldman, 2019). It is important to note that scoliosis
can worsen during puberty, and therefore dysphagia symptoms
can also worsen (Arvedson, 2013).
Many children with CP also have an elevated rib cage, shal-
low breathing, and an increased respiratory rate (Stamer, 2016).
The clinician should always observe the child eating in the
natural environment, and in as many environments as possible.
Consider the school cafeteria seating or the lack of a feeding
chair in many homes. The child’s posture may be negatively
affecting breathing and the ability to successfully self-feed and/
or swallow. In the school setting, a child with CP sometimes may
not be communicating at lunch with peers because of the effort
required to eat, or conversely, may not be eating because of the
effort needed to communicate.
Nutritional concerns for children with CP have been reported
to be as high as 90% (Inal et al., 2017). Because nutritional rec-
ommendations, such as supplements, are not within the occu-
pational therapy scope of practice, it is critical to refer to other
professionals when necessary. A new four-question Feeding and
Nutrition Screening Tool for Cerebral Palsy, developed by Bell and
colleagues (2019), is freely available for occupational therapy
practitioners and other professionals to use. This tool results in a
score indicating whether to refer for other services.
Education on safe foods for a child to eat needs to match
their skill level (versus their chronological age) and is one of
the most important steps in the evaluation process. If the child
needs a modified diet or thickened liquids for a safe swallow,
consulting a physician and the registered dietician is recom-
mended. The new International Dysphagia Diet Standardiza-
tion Initiative provides a universal definition for consistency
of liquids and food textures on one continuous scale (Cichero
et al., 2017). This is critical for the child transitioning between
environments.
Psychosocial factors is another domain within the PFD’s
definition, and it refers to both the child and the caregiver
(Goday et al., 2019). When a child has a PFD, there may be a
disruption in the bonding process between child and caregiver,
which is why “many researchers view feeding disorders as a
relationship disorder” (Didehbani et al., 2011, p. 86). Insecure
attachment and difficulty bonding are concerns for children
with CP, because of the child’s limited abilities to communi-
cate their needs to the caregiver (Barthel et al., 2016).
Given that the prevalence of feeding difficulties in children
with CP can range as high as 100% depending on the classifi-
cation system (Lagos-Guimarães et al., 2016), clinicians need
to include psychosocial concerns in their evaluation process.
Although not yet widely used across all practice settings,
including a maternal mental health screen as part of the
evaluation process is recommended as best practice (Sepul-
veda et al., 2020). Free maternal mental health screens are
available online, such as the Edinburgh Postnatal Depression
Scale (https://psychology-tools.com/epds/) and the Postpartum
Social Support Screening Tool (https://artemisguidance.com/
pssst/). Treating the child–caregiver dyad, especially when
focusing on feeding difficulties, can result in improved out-
comes when both the child and caregiver are engaged (Barlow
& Sepulveda, 2020; Sepulveda, 2019).
Feeding difficulties can impair social relationships, not only
between the caregiver and child, but also between peers as
children age. As mentioned previously, in the school cafeteria
the child with CP may be sitting unsupported at a table. Proper
positioning is critical not only for optimal swallowing results,
but also for facilitating positive behaviors and communication
with caregivers and peers (Bashar et al., 2015). One of the oral
motor deficit areas that affects the child’s ability to make friends
is drooling. Drooling occurs in up to 58% of children with CP
and can have a negative effect on a child’s mental health and
peer interactions (Erasmus et al., 2012).
The final domain to consider in the evaluation of PFDs is the
child’s feeding skills, which include not only the oral motor skills
necessary for a safe swallow, but also sensory functions, posture,
and hand-to-mouth coordination. Children with CP do not
always mouth toys like typically developing children do, delaying
the gag reflex from moving to the posterior third of the tongue,
as well as delaying tongue lateralization. The delayed integration
of reflexes affects a child’s motor skills, social skills, and feeding
skills.
It is also critical to consider the amount of time a child takes
to eat, and the energy spent when a child is eating. If mealtimes
are limited to 20 minutes in a school environment, clinicians
need to consider how many calories the child was able to
consume versus expend. When children take longer than 30
minutes to eat a meal—referred to as inefficient oral feeding—a
modified diet or consultation to a nutritionist should be consid-
ered (Goday et al., 2019).
For assessing dysphagia in preschool children with CP, the
Schedule Oral Motor Assessment and the Dysphagia Disorders
Survey have been recognized as having the “strongest clinical
utility to support clinical decision-making” (Benfer et al., 2012,
p. 794). The Rehabilitation Guideline for the Management of Chil-
dren With CP recommends that OTs use the Eating and Drinking
Ability Classification System (www.EDACS.org), which was
developed for children with CP ages 3 years and older (Human-
ity & Inclusion, 2018). A survey of more than 450 pediatric
feeding therapists (OTs and SLPs), however, found that most
clinicians used a non-standardized assessment tool to evaluate
feeding skills, followed by VFSSs and the Beckman Oral Motor
Protocol (Barlow & Rabaey, 2020). Feedingflock.com provides
clinicians with several free assessment tools, such as the Child
Oral and Motor Proficiency Scale, Family Management Measure
of Feeding, and the Pediatric Eating Assessment Tool. Feeding
Matters also has a free screening tool available on its website
(https://questionnaire.feedingmatters.org/questionnaire).
Regardless of which assessment tool you choose, it is important
that all domains of a PFD are considered and evaluated when
appropriate.
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TREATMENT
A good assessment is the key to successful treatment. It is not
possible to cover every treatment scenario, but consider a few
key points. An open mouth posture is prevalent in 93% of
children with CP (Inal et al., 2017). Training for straw drinking
can begin at 6 months (Bahr, 2010); this is critical, as research
has shown approximately 80% of children with CP who can use
a straw do not drool (Reid et al., 2012). In addition to drooling,
oral motor exercises have been shown effective in improving
tongue lateralization, lip closure, and swallowing evaluation
results (Siğan et al., 2013).
Understanding the phases of swallow, and what is occurring
in each phase, should guide your clinical reasoning as to why
your client is having swallowing difficulty. Given that children
with CP often have decreased strength of their oral motor mus-
culature, and that swallowing muscles are mostly type II muscle
fibers, interventions must be focused on increasing workload to
increase strength. Therapeutic interventions must be consis-
tently challenging, such as with increased resistance, to activate
the type II muscle fibers. Repeating the same exercises 10 times
each session for 6 weeks will not activate type II fibers, only
type I. Neuromuscular electrical stimulation (NMES) activates
type II muscle fibers first and is a great therapeutic tool for
increasing the strength of swallowing muscles for children with
CP (Song et al., 2015).
Free continuing education webinars on treating oral motor
skills are available on several websites, including Therapro
(www.therapro.com/Information-Items/Webinars/), Ages and
Stages (www.agesandstages.net/courses.php), and OT OER
(https://libguides.aic.edu/OT_OER/webinars). Beckman Oral
Motor (www.beckmanoralmotor.com/) and Talk Tools (https://
talktools.com/) have continuing education courses that focus on
oral motor skills, and are highly recommended.
EVALUATION
A team approach is always recommended for a feeding eval-
uation; however, for a child with CP, this is especially true.
Respiratory concerns, along with vision, sensory, cardiopul-
monary, nutritional, and digestive factors, should be consid-
ered in the evaluation process (Stamer, 2016). Depending
on the age of the child and individual interactions, the
various environments also need to be considered, such as
day care, school, and home settings. The complexity of the
feeding evaluation for a child with CP lends itself to the team
approach, given the expertise needed for a comprehensive
evaluation.
Examining the four domains of PFDs specific to CP, begin-
ning with the medical domain, is a recommended systematic
approach. For example, constipation and respiratory rate are
two common concerns. Constipation, due to neuromuscular
factors and decreased mobility, is common, with a prevalence of
26% to 74% in children with CP (Trivi & Hojsak, 2018). Asking
caregivers how often the child has a bowel movement and the
consistency of the stool can provide important clues in deter-
mining hunger, eating habits, and behavior.
CONCLUSION
Occupational therapy practioners are always focused on the
whole child and providing family-centered care. In treating CP,
the primary goal of intervention must be to improve the life of
the child and the family (Aggarwal et al., 2015). The complexity
of the feeding evaluation for the child with CP requires a com-
mitment to continued learning and involving the members of an
interdisciplinary team for optimal outcomes.
REFERENCES
Aggarwal, S., Chadha, R., & Pathak, R. (2015). Feeding difficulties among
children with cerebral palsy: A review. International Journal of Health Sciences
and Research, 5, 297–308. https://www.ijhsr.org/IJHSR_Vol.5_Issue.3_
March2015/43.pdf
American Occupational Therapy Association. (2010). Specialized knowledge
and skills in technology and environmental interventions for occupational
therapy practice. American Journal of Occupational Therapy, 64(Suppl.), S44
S56. https://doi.org/10.5014/ajot.2010.64S44
American Occupational Therapy Association. (2015). Occupational therapy’s role
with providing assistive technology devices and services [fact sheet]. https://
www.aota.org/-/media/Corporate/Files/AboutOT/Professionals/WhatIsOT/
RDP/Facts/AT-fact-sheet.pdf
American Occupational Therapy Association. (2017a). Occupational therapy
using a sensory integration-based approach with adult populations [fact sheet].
https://www.aota.org/-/media/Corporate/Files/AboutOT/Professionals/
WhatIsOT/PA/Facts/SI-and-Adults-Fact-Sheet.pdf
American Occupational Therapy Association. (2017b). The practice of occu-
pational therapy in feeding, eating, and swallowing. American Journal of
Occupational Therapy, 71(Suppl. 2), 7112410015. https://doi.org/10.5014/
ajot.2017.716S04
American Occupational Therapy Association. (2020). Occupational therapy
practice framework: Domain and process (4th ed.). American Journal of
Occupational Therapy, 74(Suppl. 2), 7412410010. https://doi.org/10.5014/
ajot.2020.74S2001
Arvedson, J. (2013). Feeding children with cerebral palsy and swallowing
difficulties. European Journal of Clinical Nutrition, 67, S9–S12. https://doi.
org/10.1038/ejcn.2013.224
Bahr, D. (2010). Nobody ever told me (or my mother) that! Everything from bottle
and breathing to healthy speech development. Sensory World.
Barlow, K., & Rabaey, R. (2020). Investigation of assessment tools in the area of
pediatric feeding evaluation. [Unpublished manuscript]. Division of Occupa-
tional Therapy, American International College.
Barlow, K., & Sepulveda, A. (2020). The promotion of positive mental health
for new mothers during Covid-19. World Federation of Occupational Therapists
Bulletin, 76, 86–89. https://doi.org/10.1080/14473828.2020.1822577
Barthel, K., Cayo, C., Gellert, K., & Tarduno, B. (2016). The practice of occu-
pational therapy from a neuro-developmental treatment perspective. In
J. Bierman, M. Franjoine, C. Hazzard, J. Howle, & M. Stamer (Eds.), Neu-
ro-developmental treatment: A guide to NDT clinical practice (pp. 308–324).
Thieme.
Bashar, M. K., Iqbal, S., Chowdhury, M. A., Das, D., & Iqbal, M. (2015). Devel-
opmental outcome of children with cerebral palsy after feeding and seating
intervention. Chattagram Maa-O-Shishu Hospital Medical College Journal,
14(1), 11–14. https://www.banglajol.info/index.php/CMOSHMCJ/issue/
view/1346
Bell, K., Benfer, K., Ware, R., Patrao, T., Garvey, J., Arvedson, J., … Weir, K.
(2019). Development and validation of a screening tool for feeding/swallow-
ing difficulties and undernutrition in children with cerebral palsy. Develop-
mental Medicine & Child Neurology, 61, 1175–1181. https://doi.org/10.1111/
dmcn.14220
Benfer, K., Weir, K., & Boyd, R. (2012). Clinimetrics of measures of oropharyn-
geal dysphagia for preschool children with cerebral palsy and neurodevel-
opmental disabilities: A systematic review. Developmental Medicine & Child
Neurology, 784–795. https://doi.org/10.1111/j.1469-8749.2012.04302.x
CE-7
Earn .1 AOTA CEU (one contact hour and 1.25 NBCOT PDU). See page CE-8 for details.
Continuing Education Article
CE-7
ARTICLE CODE CEA0321 | MARCH 2021 ARTICLE CODE CEA0321 | MARCH 
Brackett, K. (2016). The long road of learning to chew. http://pediatricfeeding-
news.com/the-long-of-road-of-learning-to-chew-part-1/
Cerebral Palsy Alliance. (2015). What is cerebral palsy? https://cerebralpalsy.org.
au/our-research/about-cerebral-palsy/what-is-cerebral-palsy/
Cichero, J., Lam, P., Steele, C., Hanson, B., Chen, J., Dantas, R., … Stanschus,
S. (2017). Development of international terminology and definitions for
texture-modified foods and thickened fluids used in dysphagia management:
The IDDSI framework. Dysphagia, 32, 293–314. https://doi.org/10.1007/
s00455-016-9758-y
Cieza, A., Causey, K., Kamenov, K., Hanson, S. W., Chatterji, S., & Vos, T.
(2020). Global estimates of the need for rehabilitation based on the Global
Burden of Disease study 2019: A systematic analysis for the Global Burden of
Disease study 2019. Lancet, 396, 2006–2017. https://doi.org/10.1016/S0140-
6736(20)32340-0
Didehbani, N., Kelly, K., Austin, L., & Wiechmann, A. (2011). Role of parental
stress on pediatric feeding disorders. Childrens Health Care, 40, 85–100.
https://doi.org/10.1080/02739615.2011.564557
DINES. (2019). Vital Stim® Therapy and Beyond. Career Improvement & Advance-
ment Opportunities (CIAO). https://www.ciaoseminars.com/home/vitalstim/
Edemekong, P. F., Bomgaars, D. L., Sukumaran, S., & Levy, S. B. (2020). Activi-
ties of daily living. StatPearls. https://pubmed.ncbi.nlm.nih.gov/29261878/
Erasmus, C., van Hulst, K., Rotteveel, J., Willemsen, M., & Jongerius, P. (2012).
Clinical practice: Swallowing problems in cerebral palsy. European Journal of
Pediatrics, 171, 409–414. https://doi.org/10.1007/s00431-011-1570-y
Feeding Matters. (n.d.). Evaluation & treatment: Feeding skill. https://www.feed-
ingmatters.org/what-is-pfd/feeding-skill/
Fernando, T., & Goldman, R. (2019). Management of gastroesophageal reflux disease
in pediatric patients with cerebral palsy. Canadian Family Physician, 65, 796–798.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6853361/pdf/0650796.pdf
Frakking, T., Chang, A., David, M., Orbell-Smith, J., & Weir, K. (2019). Clinical
feeding examination with cervical auscultation for detecting oropharyngeal
aspiration: A systematic review of the evidence. Clinical Otolaryngology, 44,
927–934. https://doi.org/10.1111/coa.13402
Goday, P. S., Huh, S. Y., Silverman, A., Lukens, C. T., Dodrill, P., Cohen, S. S.,
… Phalen, J. A. (2019). Pediatric feeding disorder: Consensus definition and
conceptual framework. Journal of Pediatric Gastroenterology and Nutrition, 68,
124–129. https://doi.org/10.1097/MPG.0000000000002188
Howe, T.-H., & Wang, T.-N. (2013). Systematic review of interventions used in
or relevant to occupational therapy for children with feeding difficulties ages
birth–5 years. American Journal of Occupational Therapy, 67, 405412. https://
doi.org/10.5014/ajot.2013.004564
Hulme, J. B., Shaver, J., Acher, S., Mullette, L., & Eggert, C. (1987). Effects of
adaptive seating devices on the eating and drinking of children with multiple
handicaps. American Journal of Occupational Therapy, 41, 81–89. https://doi.
org/10.5014/ajot.41.2.81
Humanity & Inclusion. (2018). Rehabilitation guideline for the management of
children with cerebral palsy: Occupational therapy guideline. USAID.
Hurley, D. (2012). Positioning for feeding success. In K. VanDahm (Ed.), Pediat-
ric feeding disorders: Evaluation and treatment (pp. 77–96). Therapro.
Inal, Ö, Serel Arslan, S., Demir, N., Tunca Yilmaz, Ö., & Karaduman, A. A.
(2017). Effect of Functional Chewing Training on tongue thrust and drooling
in children with cerebral palsy: A randomised controlled trial. Journal of Oral
Rehabilitation, 44, 843–849. https://doi.org/10.1111/joor.12544
Karagiannis, M., Chivers, L., & Karagiannis, T. (2011). Effects of oral intake of
water in patients with oropharyngeal dysphagia. BMC Geriatrics, 11, Article 9.
https://doi.org/10.1186/1471-2318-11-9
Korth, K., & Maune, N. C. (2020). Assessment and treatment of feeding, eating,
and swallowing. In J. C. O’Brien & H. Kuhaneck (Eds.), Case-Smith’s occupa-
tional therapy for children and adolescents (8th ed., pp. 212–238). Elsevier.
Korth, K., & Rendell, L. (2015). Feeding intervention. In J. Case-Smith, & J. C.
O’Brien (Eds.), Occupational therapy for children and adolescents (7th ed., pp.
389–414). Mosby.
Labaf, S., Shamsoddini, A., Hollisaz, M. T., Sobhani, V., & Shakibaee, A. (2015).
Effects of neurodevelopmental therapy on gross motor function in children
with cerebral palsy. Iranian Journal of Child Neurology, 9(2), 36–41. https://
www.ncbi.nlm.nih.gov/pmc/articles/PMC4515339/pdf/ijcn-9-036.pdf
Lagos-Guimarães, H. N. C., Teive, H. A. G., Celli, A., Santos, R. S., Abdulmassih,
E. M. d. S., Hirta, G. C., & Gallinea, L. F. (2016). Aspiration pneumonia
in children with cerebral palsy after videofluroscopic swallowing study.
International Archives of Otorhinolaryngology, 20, 132–137. https://doi.
org/10.1055/s-0035-1566093
Lino, T. B., Martinez, L. B. A., Boueri, I. Z., & Lourenço, G. F. (2020). Effects of
the use of assistive technology devices to promote independence in daily life
activities for a child with cerebral palsy. Revista Brasileira de Eduçacão Espe-
cial, 26(1), 17–32. https://doi.org/10.1590/s1413-65382620000100003
Marcus, S., & Breton, S. (2013). Infant and child feeding and swallowing: Occupa-
tional therapy assessment and intervention. AOTA Press.
Martin-Harris, B., Canon, C. L., Shaw Bonilha, H., Murray, J., Davidson, K.,
& Lefton-Greif, M. A. (2020). Best practices in modified barium swallow
studies. American Journal of Speech-Language Pathology, 29(2S), 1078–1093.
https://doi.org/10.1044/2020_AJSLP-19-00189
Novak, I., Morgan, C., Fahey, M., Finch-Edmondson, M., Galea, C., Hines,
A., … Badawi, N. (2020). State of evidence traffic lights 2019: Systematic
review of interventions for preventing and treating children with cerebral
palsy. Current Neurology and Neuroscience Reports, 20, Article 3. https://doi.
org/10.1007/s11910-020-1022-z
Paul, S., & D’Amico, M. (2013). The role of occupational therapy in the manage-
ment of feeding and swallowing disorders. New Zealand Journal of Occupation-
al Therapy, 62(2), 27–31.
Poinsett, P. M. (2020). Cerebral palsy facts and statistics. https://www.cerebralpal-
syguidance.com/cerebral-palsy/research/facts-and-statistics/
Reid, S., McCutcheon, J., Reddihough, D., & Johnson, H. (2012). Prevalence
and predictors of drooling in 7- to 14-year-old children with cerebral palsy: A
population study. Developmental Medicine & Child Neurology, 54, 1032–1036.
https://doi.org/10.1111/j.1469-8749.2012.04382.x
Reidy, T. G., Coker-Bolt, P. C., & Naber, E. (2020). Neuromotor conditions:
Cerebral palsy. In J. C. O’Brien & H. M. Kuhaneck (Eds.), Case-Smith’s occupa-
tional therapy for children and adolescents (8th ed., pp. 764–785). Elsevier.
Ross, E. (2012). Development of feeding progression. In K. VanDahm (Ed.),
Pediatric feeding disorders: Evaluation and treatment (pp. 35–53). Therapro.
Sepulveda, A. (2019). A call to action: Addressing maternal mental health in
pediatric occupational therapy practice. Annals of International Occupational
Therapy, 2, 195–200. https://doi.org/10.3928/24761222-20190813-02
Sepulveda, A, Barlow, K., Demchick, B., & Flanagan, J. (2020). Children’s men-
tal health: Promoting mental health through early screening and detection.
OT Practice, 25(4), 10–14.
Shepherd, J., & Ivey, C. (2020). Assessment and treatment of activities of daily
living, sleep, rest, and sexuality. In J. C. O’Brien & H. Kuhaneck (Eds.),
Case-Smith’s occupational therapy for children and adolescents (8th ed., pp.
267–314). Elsevier.
Siğan, S., Uzunhan, T., Aydinli, N., Eraslan, E., Ekici, B., & Çaliskan, M. (2013).
Effects of oral motor therapy in children with cerebral palsy. Annals of
Indian Academy of Neurology, 16, 342–346. https://doi.org/10.4103/0972-
2327.116923
Silverman, A., Berlin, K., Linn, C., Pederson, J., Schiedermayer, B., & Barkmei-
er-Kraemer, J. (2020). Psyochometric properties of the infant and child feed-
ing questionnaire. Journal of Pediatrics, 223, 81–86. https://doi.org/10.1016/j.
jpeds.2020.04.040
Simione, M., Dartley, A. N., Cooper-Vince, C., Martin, V., Hartnick, C., Taveras,
E. M., & Fiechtner, L. (2020). Family-centered outcomes that matter most to
parents: A pediatric feeding disorders qualitative study. Journal of Pediat-
ric Gastroenterology and Nutrition, 71, 270–275. https://doi.org/10.1097/
MPG.0000000000002741
Smith, H., Lee, S., O’Neill, P., & Connolly, M. (2000). The combination of
bedside swallowing assessment and oxygen saturation monitoring of swal-
lowing in acute stroke: A safe and humane screening tool. Age and Aging, 29,
495–499. https://doi.org/10.1093/ageing/29.6.495
Song, W. J., Park, J. H., Lee, J. H., & Kim, M. Y. (2015). Effects of neuromuscular
electrical stimulation on swallowing functions in children with cerebral
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palsy: A pilot randomized controlled trial. Hong Kong Journal of Occupational
Therapy, 25, 1–6. https://doi.org/10.1016/j.hkjot.2015.05.001
Stamer, M. (2016). Examination. In J. Bierman, M. R. Franjoine, C. Hazzard, J.
Howle, & M. Stamer (Eds.). Neuro-developmental treatment: A guide to NDT
clinical practice (pp. 74118). Thieme. he intentional relationship: Occupational
therapy and use of self. F. A. Davis.
Stavsky, M., Mor, O., Mastrolia, S. A., Greenbaum, S., Than, N. G., & Erez, O.
(2017). Cerebral palsy: Trends in epidemiology and recent development
in prenatal mechanisms of disease, treatment, and prevention. Frontiers in
Pediatrics, 5. https://doi.org/10.3389/fped.2017.00021
Toomey, K., & Ross, E. (2013). The S.O.S. sequential oral sensory approach to
feeding. Sensory Processing Disorder Foundation.
Trivić, I., & Hojsak, I. (2018). Evaluation and treatment of malnutrition and
associated gastrointestinal complications in children with cerebral palsy.
Pediatric Gastroenterology, Hepatology & Nutrition, 22, 122–131. https://doi.
org/10.5223/pghn.2019.22.2.122
VitalStim Therapy. (2015). VitalStim Therapy specialty program training manual.
Career Improvement & Advancement Opportunities (CIAO). https://www.
ciaoseminars.com/home/vitalstim/
Final Exam
Article Code CEA0321
Evaluation of Feeding, Eating, and Swallow-
ing for Children With Cerebral Palsy
To receive CE credit, exam must be completed by
March 31, 2024
Learning Level: Learning Level: Intermediate to advanced
Target Audience: Occupational Therapy Practitioners
Content Focus: Domain: Client Factors; OT Process: Occupational Therapy
Evaluation and Intervention
1. Which of the following phases of swallow is involuntary?
A. Oral prep phase
B. Anticipatory phase
C. Oral phase
D. Esophageal phase
2. In which of the following phases of swallow can aspiration
occur?
A. Oral prep phase
B. Oral phase
C. Pharyngeal phase
D. Esophageal phase
3. In which of the following phases of swallow can reflux occur?
A. Oral prep phase
B. Oral phase
C. Pharyngeal phase
D. Esophageal phase
4. Gastroesophageal reflux occurs:
A. During the unwanted opening or relaxation of the upper
esophageal sphincter
B. During the unwanted opening or relaxation of the lower
esophageal sphincter
C. When hyolaryngeal excursion is unsuccessful
D. When the pharyngeal shortening is unsuccessful
5. Which of the following is the most recommended assessment to
detect aspiration in children?
A. Videofluroscopic swallow study
B. Pulse oximeter to monitor oxygen saturation
C. Taking temperatures
D. Cervical auscultation
6. Which three muscles work together as the muscular sling
responsible for bolus propulsion?
A. Orbicularis, buccinators, and styloglossus
B. Orbicularis, buccinators, and upper pharyngeal
constrictor
C. Upper pharyngeal constrictor, styloglossus, and
geniohyoid
D. Geniohyoid, mylohyoid, and stylohyoid
7. Due to the known difficulties of attachment and bonding for
children and caregivers with feeding concerns, the occupational
therapist can include which of the following in their assessment?
A. The Feeding and Nutrition Screening Tool for Cerebral
Palsy
B. The Schedule Oral Motor Assessment
C. The Child Oral and Motor Proficiency Scale
D. Edinburgh Postnatal Depression Scale
How to Apply for
Continuing Education Credit
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the article Evaluation of Feeding, Eating, and Swallowing for Children With
Cerebral Palsy,
go to http://store.aota.org, or call toll-free 800-729-2682.
B. Once registered and payment received, you will receive instant email
confirmation.
C. Answer the questions to the final exam found on pages CE-8 & CE-9
by
March 31, 2024
D. On successful completion of the exam (a score of 75% or more), you will
immediately receive your printable certificate.
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8. Which of the following exercises has been shown to prevent
drooling?
A. Tongue lateralization exercises
B. Tongue range of motion exercises
C. Straw drinking
D. Jaw strengthening exercises
9. Which of the following is NOT true regarding the muscles
involved in swallowing?
A. Most muscles involved in swallow are Type I muscle
fibers.
B. Most muscles involved in swallow are Type II muscle
fibers.
C. Neuromuscular electrical stimulation targets Type II
muscle fibers first.
D. Exercises for swallow must consistently challenge the
patient with an increased workload.
10. Which of the following is NOT true regarding lip closure?
A. It predicts drooling
B. It creates positive pressure for bolus propulsion
C. It creates negative pressure for bolus propulsion
D. Oral motor exercises have been proven effective in the
treatment of lip closure
11. Which of the following is NOT true regarding the buccinator
muscle?
A. It narrows the oral cavity, creating positive pressure
B. It narrows the oral cavity, creating negative pressure
C. It is part of the muscular sling involved in bolus
propulsion
D. It keeps the food on the teeth while chewing
12. The gag reflex affects feeding in what way?
A. Its integration facilitates social interactions for speech
production
B. Its integration facilitates children chewing on toys for
tongue lateralization
C. Its integration facilitates children chewing on toys for lip
strength
D. Its integration facilitates bilateral hand coordination for
pacifier use