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Failure to Thrive (FTT) in Pediatrics - Long Case

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Definition

• Weight consistently below the 3rd (or 5th) percentile for age and sex on standard growth charts, OR
• Weight crossing two major percentile lines downward over time, OR
• Weight for height below the 5th percentile (wasting)

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Classification

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Causes

Nonorganic / Psychosocial

• Maternal deprivation, parental neglect, or ignorance of infant feeding needs
• Poverty and food insecurity
• Errors in formula preparation (over-dilution)
• Inappropriate feeding practices (early solids, improper positioning)
• Disturbed caregiver-infant relationship (maternal depression, postnatal depression)
• Psychosocial dwarfism - in older children: growth retardation with bizarre eating behaviors (e.g., eating from garbage cans, binge-purge), accompanied by reversible GH deficiency that normalizes when the child is removed from the dysfunctional environment

Organic Causes - Classified by Mechanism

• Oral-motor dysfunction, cleft palate, tracheoesophageal fistula
• GERD, pyloric stenosis
• Congenital heart disease (fatigue during feeding)
• Central nervous system abnormalities
• Laryngomalacia (dyspnea on feeding)

• Cystic fibrosis (most common cause of FTT with malabsorption)
• Celiac disease
• Cow's milk protein intolerance
• Short bowel syndrome
• Biliary atresia, neonatal hepatitis
• Inflammatory bowel disease

• Congenital heart disease (left-to-right shunts, cyanotic heart disease)
• Chronic lung disease, bronchopulmonary dysplasia
• Chronic infections (HIV, TB, recurrent bacterial infections)
• Malignancy
• Inborn errors of metabolism

• Chromosomal disorders (Down syndrome, Turner syndrome)
• Hypothyroidism
• Renal tubular acidosis, chronic kidney disease
• Diabetes insipidus
• Severe combined immunodeficiency (SCID)
• Inborn errors of metabolism (glycogen storage diseases, organic acidemias)

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Clinical Approach - History

Presenting Complaints

• Poor weight gain / not gaining weight appropriately
• Feeding difficulties - slow feeding, vomiting, choking, refusal
• Recurrent infections, chronic diarrhea, loose stools
• Delayed milestones

Dietary History (KEY)

• Detailed feeding record - breastfed vs. formula, frequency, duration, volume
• If formula: preparation technique (is it being diluted?)
• Introduction of solids: timing, types, amounts
• 3-day food diary is extremely helpful
• Any food aversions, textures refused
• Who feeds the child and how?

Birth History

• Birth weight and gestational age
• Intrauterine growth restriction (IUGR)
• Perinatal complications, anoxia

Past Medical History

• Recurrent hospitalizations, infections
• Chronic illnesses, medications
• Developmental milestones (motor, speech, social)

Family/Social History

• Parental heights - mid-parental height calculation
• Parental education, employment, socioeconomic status
• Mental health of caregivers (maternal depression)
• Substance abuse in household
• Family history of CF, celiac, metabolic disorders, short stature

Developmental History

• Global developmental delay may indicate a syndrome or CNS cause
• Milestones appropriate vs. delayed

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Clinical Approach - Physical Examination

Anthropometry (MANDATORY and most important)

• Weight (most sensitive early indicator, affected first)
• Height/Length (affected later - chronic malnutrition)
• Head circumference (last to be affected; if decreased = chronic severe malnutrition or CNS pathology)
• Plot all parameters on appropriate age/sex growth charts
• For premature infants: use corrected gestational age on special preterm growth charts

Pattern Recognition

Signs of Malnutrition

• Wasting: loss of subcutaneous fat over buttocks, inner thighs, suprascapular region (examine these areas!)
• Prominent ribs, narrow face, thin limbs
• Edema (in severe protein deficiency - kwashiorkor)
• Dermatitis: peeling skin, diaper rash, hyperpigmentation/depigmentation in protein-calorie malnutrition
• Hair changes: sparse, depigmented, easily plucked hair
• Muscle wasting - assess biceps and quadriceps

Micronutrient Deficiency Signs

• Vitamin D deficiency: rachitic rosary, widened wrists/ankles, craniotabes, genu varum/valgum, frontal bossing
• Vitamin C deficiency: perifollicular hemorrhage, bleeding gums
• Iron deficiency: pallor, koilonychia
• Zinc deficiency: perioral/perianal dermatitis, vesicobullous lesions
• Vitamin A deficiency: Bitot spots, xerophthalmia

Dysmorphic Features

• Suggest chromosomal cause (Down, Turner, Williams syndrome)

Organomegaly

• Hepatomegaly - liver disease, metabolic storage disorders, heart failure
• Lymphadenopathy - HIV, TB, malignancy

Cardiorespiratory

• Heart murmur - congenital heart disease
• Crepitations - chronic lung disease, CF

Neglect Indicators

• Poor hygiene, dirty clothing, uncut nails, diaper rash
• Flat affect, listlessness, poor eye contact, developmental regression
• Observe parent-child interaction carefully

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Investigations

Initial / First-Line (if organic FTT suspected or workup warranted)

Second-Line (based on clinical suspicion)

Harriet Lane Handbook: "Routine labs and imaging are often low yield and generally not recommended; workup should be guided by clinical suspicion." - The Harriet Lane Handbook, 23rd Edition

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Diagnostic Flowchart

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Management

Inpatient vs. Outpatient

• Severe malnutrition or risk of re-feeding syndrome
• Suspected abuse or neglect where home safety is uncertain
• Social situation prevents safe outpatient follow-up
• Failed outpatient management
• Severe psychological caregiver impairment
• Acute fluid and electrolyte imbalance
• If nonorganic: allows direct observation of mother-child interaction and feeding

• 3-day food diary, calculate actual vs. required caloric intake
• Increase caloric density
• Multivitamin supplementation
• Weekly weight checks initially

Nutritional Rehabilitation

RDA calories for age × (Ideal body weight for height / Actual body weight)

• RDA for age = 98 kcal/kg/day
• Ideal weight for height (50th percentile) = 9 kg
• Catch-up requirement = 98 × (9/7) = 126 kcal/kg/day

Nutritional Strategies

• Breastfed infants: optimize positioning, latch, frequency; consider supplemental nursing system
• Formula-fed infants: ensure correct preparation; consider calorie-dense formula (24-27 kcal/oz)
• Older children: calorie-dense foods (nut butters, avocado, cheese, fortified cereals); limit juice and low-calorie drinks
• Micronutrient supplementation: iron, zinc, vitamin D as indicated
• Appetite stimulants (cyproheptadine, megestrol): considered in children with significant underlying disease (CF, cancer) - not routine

Re-feeding Syndrome (Critical Complication)

• Electrolyte shifts (especially hypophosphatemia, hypokalemia, hypomagnesemia)
• Cardiac arrhythmias, respiratory failure, seizures
• Management: daily cardiorespiratory monitoring, strict I/O and calorie count, daily electrolytes (especially phosphate), correct deficiencies before and during refeeding

Treating Underlying Cause

• Address specific organic cause (CF enzyme replacement, celiac - gluten-free diet, hypothyroidism - levothyroxine, CHD - surgical correction)

Psychosocial Intervention (Nonorganic FTT)

• Non-judgmental parent education about feeding practices
• Observe and address dysfunctional parent-child feeding interaction
• Social work referral for poverty, food insecurity
• Mental health referral for maternal depression
• If child abuse or neglect suspected: mandatory reporting to child protective services
• Home visits by public health nurse are highly effective

Follow-Up

• Weekly weight checks initially after discharge
• Some home visits should occur in the child's home environment (especially for nonorganic FTT)
• Target "catch-up growth" over 3-6 months

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Prognosis

• Most infants identified early and treated do not progress to severe malnutrition, growth delay, or long-term developmental problems
• Later onset feeding disorders have worse outcomes
• Nonorganic FTT: prognosis depends heavily on the degree of family dysfunction and response to intervention
• Children with untreated severe FTT may suffer cognitive impairment and long-term psychosocial difficulties
• Psychosocial dwarfism: endocrine abnormalities and growth often normalize once the child is removed from the dysfunctional environment

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Key Exam Points (Long Case Summary)

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