A 18-month-old boy is brought to the pediatric clinic by his mother for routine growth assessment. Birth weight was 3.2 kg, and length was 50 cm. Current weight is 10.5 kg and length is 78 cm. Mother reports he was exclusively breastfed for 6 months, then introduced to complementary feeding. On examination, he is active and playful with no dysmorphic features. His weight-for-age and length-for-age are both between the 25th and 50th percentiles on the WHO growth chart. However, his weight-for-length is below the 5th percentile. What is the most appropriate interpretation of this anthropometric pattern?

Explanation

## Interpretation of Growth Chart Patterns **Key Point:** The anthropometric indices must be interpreted together to classify the type and chronicity of malnutrition. ### Classification of Malnutrition by Growth Parameters | Parameter | Acute Malnutrition | Chronic Malnutrition | Normal Growth | |-----------|-------------------|----------------------|---------------| | Weight-for-age | Low | Low | Normal | | Length-for-age | Normal/Preserved | Low (stunting) | Normal | | Weight-for-length | **Low (wasting)** | Normal/Preserved | Normal | | Timeline | Weeks to months | Months to years | — | **High-Yield:** In this case: - Weight-for-age is 25–50th percentile (acceptable) - Length-for-age is 25–50th percentile (preserved, not stunted) - Weight-for-length is <5th percentile (wasting present) This pattern is **pathognomonic for acute malnutrition (wasting)**. The child has lost weight relative to his length, but has not yet had sufficient time or severity of nutritional deficit to affect linear growth. ### Clinical Significance **Clinical Pearl:** Acute malnutrition is reversible with prompt nutritional rehabilitation and has better prognosis than chronic malnutrition. Wasting indicates recent/ongoing nutritional inadequacy and requires urgent intervention. **Mnemonic: WAL (Weight-for-Age, Length-for-age, Weight-for-Length)** - **Acute wasting:** ↓ W-for-L only (recent onset) - **Chronic stunting:** ↓ L-for-age ± ↓ W-for-age (long-standing) - **Both:** ↓ all three (severe, prolonged malnutrition) ### Management Implications 1. Assess adequacy of complementary feeding (quantity, quality, frequency) 2. Investigate for infections (recurrent diarrhea, respiratory infections) 3. Nutritional rehabilitation with energy-dense foods 4. Micronutrient supplementation (iron, vitamin A, zinc) 5. Follow-up anthropometry at 4–6 weeks [cite:Park 26e Ch 10]