## Understanding WHO Growth Chart Interpretation **Key Point:** The WHO growth charts are the internationally accepted standard for assessing child growth, but interpretation of stunting requires age-specific criteria. ### Correct Statements (Options 0, 1, 3) | Statement | Why Correct | |-----------|-------------| | WHO charts represent optimal growth | Based on data from well-nourished children from 6 countries; reflect genetic potential | | Primary indices are length/height, weight for age, weight for height | These are the three core anthropometric parameters | | IAP recommends WHO charts for Indian children | Adopted by Indian Academy of Pediatrics as standard reference | ### The Incorrect Statement (Option 2) **High-Yield:** Stunting is defined as **height-for-age below -2 SD (or <3rd percentile) ONLY in children aged ≥2 years**. In children <2 years, the interpretation differs because: 1. Length measurements are more variable in infants 2. Catch-up growth potential is higher in younger children 3. WHO recommends length-for-age assessment but stunting classification is age-dependent **Clinical Pearl:** A 6-month-old infant plotting at the 2nd percentile for length-for-age is NOT classified as stunted — this is within normal variation. The same child at age 3 years with similar percentile would be stunted. **Warning:** Confusing percentile position with stunting classification is a common exam trap. Always verify the child's age before labeling growth failure. ### WHO Chart Indices Summary - **Length/Height-for-Age:** Reflects long-term nutrition and growth potential - **Weight-for-Age:** Reflects overall growth status (nonspecific) - **Weight-for-Height:** Reflects acute nutritional status (sensitive to recent changes) [cite:IAP Growth Chart Guidelines, Park 26e Ch 5]
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