Growth failure — historically termed "failure to thrive" (FTT) — is defined as weight-for-age consistently below the 3rd percentile on standardized growth charts, OR a drop across two or more major weight-for-age percentile lines over time (e.g., from 75th to 25th), OR a weight-for-length ratio below the 2nd percentile. In Canadian clinical practice, World Health Organization (WHO) growth standards are used for children birth to 24 months; CDC growth charts for ages 2–19 years. Missing growth failure leads to permanent consequences: stunted linear growth, impaired neurodevelopmental outcomes, immune suppression, and catch-up failure if nutritional rehabilitation begins after age 2 years. Top 3 Nursing Priorities: 1. Obtain accurate, reproducible weight and length/height using proper technique (calibrated scale, supine length board for <2 years, standing height for ≥2 years without shoes) and plot on the correct WHO or CDC chart — the NCLEX trap is failing to use age-appropriate measurement or chart type 2. Differentiate organic (medical) from non-organic (psychosocial/nutritional) from mixed causes using a structured history — intake, absorption, utilization, and output — before pursuing costly investigations 3. Identify red flags...