A two-year-old female presents to the pediatrician with her mother for a routine well-child visit. Her mother is concerned that the patient is a picky eater and refuses to eat vegetables. She drinks milk with meals and has juice sparingly. She goes to sleep easily at night and usually sleeps for 11-12 hours. The patient has trouble falling asleep for naps but does nap for 1-2 hours a few times per week. She is doing well in daycare and enjoys parallel play with the other children. Her mother reports that she can walk down stairs with both feet on each step. She has a vocabulary of 10-25 words that she uses in the form of one-word commands. She is in the 42nd percentile for height and 48th percentile for weight, which is consistent with her growth curves. On physical exam, she appears well nourished. She can copy a line and throw a ball. She can follow the command to “give me the ball and then close the door.” This child is meeting her developmental milestones in all but which of the following categories?

Social and receptive language skills

This child is developmentally normal

A 7-year-old girl presents to her primary care physician for a routine check-up. The physician allows the medical student to perform a physical examination. The medical student notes hearing impairment as well as the findings show in Figures A and B. Radiographs show indications of multiple old fractures of the humerus that have healed. After questioning the girl’s parents, the medical student learns that in addition, the patient is extremely picky with her food and eats a diet consisting mainly of cereal and pasta. What is the most likely etiology of the patient’s disease?

Dietary deficiency of ascorbic acid

Defective mineralization of cartilage

A 7-year-old boy is brought in to clinic by his parents with a chief concern of poor performance in school. The parents were told by the teacher that the student often does not turn in assignments, and when he does they are partially complete. The child also often shouts out answers to questions and has trouble participating in class sports as he does not follow the rules. The parents of this child also note similar behaviors at home and have trouble getting their child to focus on any task such as reading. The child is even unable to watch full episodes of his favorite television show without getting distracted by other activities. The child begins a trial of behavioral therapy that fails. The physician then tries pharmacological therapy. Which of the following is most likely the mechanism of action of an appropriate treatment for this child's condition?

Decreases synaptic reuptake of norepinephrine and dopamine

Increases the frequency of GABAa channel opening

Increases the duration of GABAa channel opening

A previously healthy 21-year-old woman is brought to the physician because of weight loss and fatigue. Over the past 12 months she has lost 10.5 kg (23.1 lb). She feels tired almost every day and says that she has to go running for 2 hours every morning to wake up. She had been a vegetarian for 2 years but decided to become a vegan 6 months ago. She lives with her mother, who has obsessive-compulsive disorder. The mother reports that her daughter refuses to eat with the family and only eats food that she has prepared herself. When asked about her weight, the patient says that despite her weight loss, she still feels “chubby”. She is 160 cm (5 ft 3 in) tall and weighs 42 kg (92.6 lb); BMI is 16.4 kg/m2. Her temperature is 35.7°C (96.3°F), pulse is 39/min, and blood pressure is 100/50 mm Hg. Physical examination shows emaciation. There is dry skin, covered by fine, soft hair all over the body. On mental status examination, she is oriented to person, place, and time. Serum studies show: Na+ 142 mEq/L Cl 103 mEq/L K+ 4.0 mEq/L Urea nitrogen 10 mg/dL Creatinine 1.0 mg/dL Glucose 65 mg/dL Which of the following is the most appropriate next step in management?

Inpatient nutritional rehabilitation

Hospitalization and topiramate therapy

Hospitalization and fluoxetine therapy

Food diary and outpatient follow-up

Outpatient psychodynamic psychotherapy

A 2-year-old boy is brought to a pediatrician because his parents have noticed that he seems to be getting tired very easily at home. Specifically, they have noticed that he is often panting for breath after walking around the house for a few minutes and that he needs to take naps fairly often throughout the day. He has otherwise been well, and his parents do not recall any recent infections. He was born at home, and his mom did not receive any prenatal care prior to birth. Physical exam reveals a high-pitched, harsh, holosystolic murmur that is best heard at the lower left sternal border. No cyanosis is observed. Which of the following oxygen tension profiles would most likely be seen in this patient? (LV = left ventricle, RV = right ventricle, and SC = systemic circulation).

LV: normal, RV: increased, SC: normal

LV: normal, RV: normal, SC: normal

LV: decreased, RV: increased, SC: decreased

LV: decreased, RV: normal, SC: decreased

LV: normal, RV: normal, SC: decreased

A 4-week-old infant is brought to the physician by his mother because of blood-tinged stools for 3 days. He has also been passing whitish mucoid strings with the stools during this period. He was delivered at 38 weeks' gestation by lower segment transverse cesarean section because of a nonreassuring fetal heart rate. He was monitored in the intensive care unit for a day prior to being discharged. His 6-year-old brother was treated for viral gastroenteritis one week ago. The patient is exclusively breastfed. He is at the 50th percentile for height and 60th percentile for weight. He appears healthy and active. His vital signs are within normal limits. Examination shows a soft and nontender abdomen. The liver is palpated just below the right costal margin. The remainder of the examination shows no abnormalities. Test of the stool for occult blood is positive. A complete blood count and serum concentrations of electrolytes and creatinine are within the reference range. Which of the following is the most appropriate next step in management?

Continue breastfeeding and advise mother to avoid dairy and soy products

Perform stool antigen immunoassay

Perform an air enema on the infant

Assess for IgA (anti‑)tissue transglutaminase antibodies (tTG)

Stop breastfeeding and switch to soy-based formula

A 1-day-old infant in the general care nursery, born at full term by uncomplicated cesarean section delivery, is noted to have a murmur, but otherwise appears well. On examination, respiratory rate is 40/min and pulse oximetry is 96%. Precordium is normoactive. With auscultation, S1 is normal, S2 is single, and a 2/6 systolic ejection murmur is heard at the left upper sternal border. Echocardiography shows infundibular pulmonary stenosis, overriding aorta, ventricular septal defect and concentric right ventricular hypertrophy. Which of the following correlate with the presence or absence of cyanosis in this baby?

The degree of right ventricular outflow tract obstruction

The ratio of reduced hemoglobin to oxyhemoglobin

The concentration of hemoglobin

The size of ventricular septal defect

The concentration of pulmonary surfactant

Feeding disorders in children for USMLE Step 3: High-Yield Pediatrics Lessons

Overview & Types - Picky Eaters vs Problem Feeders

Feeding disorders involve refusing food or having a restricted diet for >1 month, leading to nutritional deficits or impaired function. Differentiated from transient picky eating, a normal developmental phase.

Feature	Picky Eater	Problem Feeder
Food Variety	>30 foods	<20 foods
Food Groups	Eats ≥1 food from most	Skips entire food groups
New Foods	Accepts after multiple tries	Cries/tantrums with new food
Family Meals	Eats same meal, just less	Requires a separate meal
%%{init: {'flowchart': {'htmlLabels': true}}}%%
flowchart TD

Start["👶 Normal Development
• Typical growth• Age appropriate"]

Picky["🍽️ Picky Eating Phase
• Limited variety• Food refusal"]

Resolves["✅ Resolves With Time
• Normal variation• Spontaneous exit"]

Severe["⚠️ Persistent and Severe
• Chronic issues• Narrow selection"]

Disorder["🩺 Feeding Disorder
• Problem feeder• Intervention needed"]

Start --> Picky Picky -->|Transient| Resolves Picky -->|Ongoing| Severe Severe --> Disorder

style Start fill:#F6F5F5, stroke:#D1D5DB, stroke-width:1.5px, rx:12, ry:12, color:#525252 style Picky fill:#FEF8EC, stroke:#FBECCA, stroke-width:1.5px, rx:12, ry:12, color:#854D0E style Resolves fill:#F1FCF5, stroke:#BEF4D8, stroke-width:1.5px, rx:12, ry:12, color:#166534 style Severe fill:#FDF4F3, stroke:#FCE6E4, stroke-width:1.5px, rx:12, ry:12, color:#B91C1C style Disorder fill:#F7F5FD, stroke:#F0EDFA, stroke-width:1.5px, rx:12, ry:12, color:#6B21A8


> ⭐ **High-Yield:** Problem feeders often have a severely restricted food repertoire of fewer than **20** specific food items, a key diagnostic red flag.

## Etiology & Risk Factors - Why Won't They Eat?

*   **Organic Causes (Hardware Issues)**
    -   Gastrointestinal: GERD, eosinophilic esophagitis, constipation, food allergies
    -   Cardiorespiratory: Chronic lung disease, congenital heart defects
    -   Neurological: Cerebral palsy, hypotonia, cranial nerve palsies
    -   Anatomical: Cleft lip/palate, tongue-tie (ankyloglossia)

*   **Developmental & Behavioral (Software Issues)**
    -   Oral-motor skill delay: Poor suck/swallow/chew coordination
    -   Sensory processing disorders: Aversion to textures, smells, or tastes
    -   Autism Spectrum Disorder (ASD): Restricted interests, rigidity

*   **Psychosocial & Environmental (User Error)**
    -   Parent-child interaction: Coercive/forceful feeding, parental anxiety
    -   Inappropriate expectations or mealtime structure
    -   Behavioral mismanagement: Allowing grazing, long meal times (>**30** min)

> ⭐ **High-Yield:** History of prematurity, low birth weight (LBW), and prolonged neonatal ICU stays are major risk factors for developing severe feeding disorders.

![Multifactorial Etiology of Pediatric Feeding Disorders](https://ylbwdadhbcjolwylidja.supabase.co/storage/v1/object/public/notes/L1/Pediatrics_Nutritional_requirements_and_disorders_Feeding_disorders_in_children/5651148f-3f2c-4595-9d6a-e869bfd3d6e7.jpg)

## Clinical Evaluation - The Feeding Detective Work
*   **Comprehensive History:**
    -   **Feeding Diary:** Document what, when, how much, duration, and specific symptoms (choking, gagging, refusal).
    -   **Developmental & Medical Hx:** Note birth history, milestones, and recurrent infections.
*   **Physical & Oral-Motor Exam:**
    -   **Growth Assessment:** Plot weight, height, and head circumference. **Weight-for-length** is a critical indicator for Failure to Thrive (FTT).
    -   **Oral-Motor Skills:** Directly observe suck-swallow-breathe coordination. Check for tongue-tie, high-arched palate, or clefts.

> ⭐ Direct observation of a feeding session is the single most crucial diagnostic step. It reveals parent-child interaction, motor skills, and subtle signs of distress.

```mermaid
%%{init: {'flowchart': {'htmlLabels': true}}}%%
flowchart TD

History["<b>📋 History & Exam</b><br><span style='display:block; text-align:left; color:#555'>• Clinical screen</span><span style='display:block; text-align:left; color:#555'>• Review symptoms</span>"]

Observe["<b>👁️ Observe Feed</b><br><span style='display:block; text-align:left; color:#555'>• Watch technique</span><span style='display:block; text-align:left; color:#555'>• Assess swallow</span>"]

RedFlags{"<b>⚠️ Red Flags?</b><br><span style='display:block; text-align:left; color:#555'>• Identify risks</span><span style='display:block; text-align:left; color:#555'>• Urgent signs</span>"}

Investigations["<b>🔬 Investigations</b><br><span style='display:block; text-align:left; color:#555'>• Barium swallow</span><span style='display:block; text-align:left; color:#555'>• Targeted tests</span>"]

Management["<b>💊 Management</b><br><span style='display:block; text-align:left; color:#555'>• Behavioral care</span><span style='display:block; text-align:left; color:#555'>• Dietary changes</span>"]

History --> Observe
Observe --> RedFlags
RedFlags -->|Yes| Investigations
RedFlags -->|No| Management
Investigations --> Management

style History fill:#FEF8EC, stroke:#FBECCA, stroke-width:1.5px, rx:12, ry:12, color:#854D0E
style Observe fill:#EEFAFF, stroke:#DAF3FF, stroke-width:1.5px, rx:12, ry:12, color:#0369A1
style RedFlags fill:#FDF4F3, stroke:#FCE6E4, stroke-width:1.5px, rx:12, ry:12, color:#B91C1C
style Investigations fill:#FFF7ED, stroke:#FFEED5, stroke-width:1.5px, rx:12, ry:12, color:#C2410C
style Management fill:#F1FCF5, stroke:#BEF4D8, stroke-width:1.5px, rx:12, ry:12, color:#166534

Management Approach - Fixing the Food Fight

Parental Education & Routine:
- Establish structured meal & snack times.
- Limit meal duration to 20-30 minutes.
- Minimize distractions (no screens).
- Maintain a calm, neutral attitude.
Behavioral Strategies:
- Positive Reinforcement: Praise for trying new foods (avoid food rewards).
- Systematic Exposure: Repeated, neutral offerings of new foods (may take 10-15 tries).
- Modeling: Parents eat the same food.
Medical/Nutritional Therapy:
- Address any underlying organic cause.
- High-calorie supplements if FTT is present.
- Appetite stimulants (e.g., Cyproheptadine) are rarely used.

⭐ Ellyn Satter's Division of Responsibility: The parent is responsible for what, when, where of feeding; the child is responsible for how much and whether they eat.

Ellyn Satter's Division of Responsibility in Feeding

High‑Yield Points - ⚡ Biggest Takeaways

Pica, the compulsive eating of non-nutritive substances, is strongly associated with iron deficiency anemia and lead poisoning.

Rumination disorder involves repeated, effortless regurgitation and re-chewing of food, typically seen in infants 3-12 months old.

Avoidant/Restrictive Food Intake Disorder (ARFID) is food avoidance without body image distortion, leading to significant nutritional deficiencies.

Unlike anorexia nervosa, ARFID lacks the intense fear of gaining weight or distorted body perception.

Management is multidisciplinary, centered on behavioral therapy and correcting nutritional deficiencies.

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