Managing Failure To Thrive

Required Documents

• Serial growth measurements (minimum 3 data points over time preferred)
• Growth chart plots on WHO (< 2 years) or CDC (2-20 years) standards
• Feeding log or dietary recall
• Prior lab results (if any workup has been done)
• Social work or home visit notes (if applicable)

FTT is defined by growth pattern, not a single measurement. At least 2-3 data points over time are needed to establish a trajectory.

Step 1 — Growth Pattern Classification

Defining FTT (Use ANY of the Following)

• Weight < 2nd percentile (WHO) for age and sex
• Weight-for-length < 2nd percentile
• Weight crossing downward across 2 or more major percentile lines (95th, 90th, 75th, 50th, 25th, 10th, 5th)
• Weight velocity < 5th percentile for age over a defined interval
• Weight-for-age < 80% of median (Gomez classification: mild 75-90%, moderate 60-74%, severe < 60%)

Growth Pattern Differential

Mid-Parental Height Calculation

• Boys: (maternal height + paternal height + 13 cm) / 2 ± 8.5 cm
• Girls: (maternal height + paternal height - 13 cm) / 2 ± 8.5 cm
• Plot target height range on growth chart to differentiate FTT from familial short stature

Step 2 — Caloric Needs Calculation

Estimated Energy Requirements (EER)

Catch-Up Growth Requirement

Catch-up kcal/kg/day = (EER for age × ideal weight for height) / actual weight

Example: 9-month-old, actual weight 6 kg, ideal weight for height 8.5 kg

• Catch-up calories = (90 × 8.5) / 6 = 127.5 kcal/kg/day based on actual weight

Catch-Up Protein

• Catch-up protein (g/kg/day) = (protein RDA × ideal weight for height) / actual weight
• Minimum 2-3 g/kg/day protein for catch-up; higher for severe malnutrition

Practical Fortification Strategies

• Breast milk fortification: add human milk fortifier (for NICU-discharged infants) or supplement with formula after breastfeeding
• Formula concentration: advance from 20 to 22 to 24 kcal/oz (monitor for osmolar diarrhea)
• Solid food enrichment: add butter, oil, cheese, avocado to increase caloric density
• Oral supplements: PediaSure (30 kcal/oz), Duocal, MCT oil for high caloric density

Step 3 — Tiered Diagnostic Workup

Tier 1 — Initial Screen (All FTT Patients)

• CBC with differential
• CMP (electrolytes, BUN, creatinine, glucose, albumin, calcium, phosphorus, LFTs)
• Urinalysis and urine culture
• Lead level (if age 1-5 years or risk factors)
• Consider: TSH, celiac panel (tTG-IgA + total IgA)

Tier 2 — Directed by History/Exam Findings

Tier 3 — Subspecialty Evaluation

• Pediatric GI: persistent diarrhea, suspected IBD, eosinophilic esophagitis, need for endoscopy
• Pediatric endocrine: growth velocity < 5 cm/year with normal nutrition, suspected GH deficiency
• Genetics: dysmorphic features, global delay, suspected syndromic cause
• Social work: food insecurity, neglect concern, caregiver mental health

Fewer than 5% of FTT cases have an identifiable organic cause on initial labs. Over-testing without clinical indication adds cost without yield.

Step 4 — Multidisciplinary Intervention Plan

Nutritional Intervention

• Set specific caloric targets based on catch-up calculation (Step 2)
• Provide written feeding plan with meal/snack schedule and portion guidance
• Involve dietitian/nutritionist for ongoing counseling
• Schedule weight checks: weekly for severe FTT, every 2 weeks for moderate, monthly for mild

Behavioral Feeding Strategies

• Structured mealtimes (3 meals + 2-3 snacks; no grazing)
• Limit juice to 4 oz/day; no calorie-free beverages during meals
• Offer calorie-dense foods first before low-density options
• Avoid food battles; neutral mealtime environment
• Feeding therapy referral for oral motor dysfunction, food aversion, or texture sensitivity

Psychosocial Support

• Screen for caregiver depression (Edinburgh, PHQ-9)
• Assess food security (2-item Hunger Vital Sign: "Within the past 12 months, we worried whether our food would run out..." and "...the food we bought just didn't last...")
• Connect to WIC, SNAP, food banks as appropriate
• Social work referral for suspected neglect, domestic violence, or housing instability

Hospitalization Criteria

• Severe malnutrition (weight < 60% ideal body weight)
• Dehydration or electrolyte abnormalities
• Failure to gain weight after 2-3 months of outpatient intervention with confirmed adequate intake
• Suspected abuse or neglect requiring safe placement
• Need for observed feeding and calorie counts in controlled environment

Step 5 — Monitoring and Catch-Up Targets

Expected Weight Gain Velocity

Catch-Up Growth Monitoring

• Weight gain should exceed normal velocity by 2-3× during catch-up phase
• Weight catch-up typically precedes length catch-up by weeks to months
• Head circumference catch-up is slowest and may not fully recover in severe cases
• Refeeding syndrome risk: monitor phosphorus, magnesium, and potassium in severely malnourished children when refeeding — especially in the first 7-10 days

Checkpoint B — FTT Management Review

• Growth parameters plotted with trajectory documented (weight, length, HC)
• FTT classification stated (acute vs. chronic, severity grade)
• Caloric needs calculated with catch-up target specified
• Feeding plan created with specific kcal/day goal and strategies
• Tier 1 labs ordered or reviewed
• Directed workup ordered based on clinical clues (if applicable)
• Psychosocial assessment completed (food security, caregiver mental health)
• Subspecialty referrals placed where indicated
• Weight check schedule established
• All [VERIFY] flags resolved or escalated

Quality Audit

Guidelines

• Use WHO growth standards (birth to 2 years) and CDC growth charts (2-20 years) per AAP recommendation
• Apply Gomez classification for severity grading of protein-energy malnutrition
• Follow AAP guidance on diagnosis and management of FTT/pediatric undernutrition
• Caloric catch-up formula: (EER × ideal weight for current length) / actual weight
• Follow ESPGHAN guidelines for nutritional rehabilitation in pediatric undernutrition
• WIC (Women, Infants, and Children) program: refer all eligible families
• Hunger Vital Sign (2-item food insecurity screen) validated for pediatric populations
• Refeeding syndrome protocols: monitor electrolytes closely when initiating feeds in severely malnourished children
• Mandatory reporting obligation: if FTT is due to suspected neglect, file with Child Protective Services per state law
• This skill produces clinical documentation; it does not replace clinical judgment