| name | eso-pediatric-obesity-infant-diagnosis |
| description | Diagnoses obesity in infants and toddlers under 2 years of age when sex-specific weight-for-recumbent length is at or above the 97.7th percentile on WHO growth charts. Consider this assessment during well-child visits when caregivers report excessive weight gain, crossing of percentile channels, or when length and weight measurements suggest disproportionate adiposity. |
Diagnose obesity in infants using weight-for-length percentile
STEP 1 — Gather Information
Collect infant's sex, age, weight (kg), and recumbent length (cm). Ensure length is measured supine with infant fully extended. Plot these values on the WHO weight-for-length percentile chart corresponding to the infant's sex and exact age.
STEP 2 — Rule In / Rule Out
Determine the weight-for-length percentile from the plotted point. If the percentile is ≥97.7th, rule in obesity; if the percentile is <97.7th, rule out obesity for this assessment.
STEP 3 — Classify or Stratify
Classify the infant as obese when the weight-for-recumbent length is at or above the 97.7th percentile on the WHO chart. No further subcategorization is recommended for this age group per guideline.
STEP 4 — Decide
For infants classified as obese, initiate preventive counseling on age-appropriate feeding practices (e.g., responsive feeding, avoidance of sugar-sweetened beverages), schedule weight-for-length monitoring every 1–2 months, and evaluate for underlying endocrine or genetic causes only if growth velocity is aberrant or comorbidities are suspected.
Clinical Guardrails / Mimics / Pitfalls
Do not use CDC BMI charts for children <2 years; do not rely on weight-for-length after the second birthday; avoid mismeasuring recumbent length (must be supine, not standing); do not apply the ≥97.7th percentile threshold to preterm infants without adjusting for gestational age.
Concrete Clinical Example
A 9‑month‑old male presents for well‑child visit; weight 10.5 kg, length 70 cm. Plotting on WHO boys’ weight‑for‑length chart shows the 98th percentile. Since this exceeds the 97.7th percentile, obesity is diagnosed, and feeding counseling is initiated.
Source: Pediatric Obesity Assessment, Treatment, and Prevention: An Endocrine Society Clinical Practice Guideline, Endocrine Society, 2017, DOI:10.1210/jc.2016-2573
TODO: consider adding scripts/calc.py for the eso-pediatric-obesity-infant-diagnosis calculator
