A 3-year-old boy from rural Maharashtra is brought to the pediatric clinic by his mother for routine health check-up. On examination, his weight is 12 kg and height is 88 cm. His mother reports that he was born at term with a birth weight of 2.8 kg and birth length of 48 cm. He has been exclusively breastfed until 6 months and is now on mixed feeding. On plotting his measurements on the WHO growth chart, his weight-for-age falls at the 5th percentile and his height-for-age falls at the 10th percentile. His weight-for-height is at the 25th percentile. Which pattern of growth does this child demonstrate?

Explanation

## Classification of Malnutrition Using Growth Charts ### Understanding the Growth Pattern **Key Point:** The child's anthropometric indices reveal a pattern consistent with chronic malnutrition (stunting): - **Height-for-age:** 10th percentile (LOW) — indicates stunting - **Weight-for-age:** 5th percentile (LOW) - **Weight-for-height:** 25th percentile (RELATIVELY PRESERVED) — indicates normal or near-normal muscle mass ### Differential Diagnosis of Malnutrition Patterns | Parameter | Acute Malnutrition | Chronic Malnutrition | Acute-on-Chronic | |-----------|-------------------|----------------------|-------------------| | **Height-for-age** | Normal or near-normal | **Markedly reduced (<-2 SD)** | Markedly reduced | | **Weight-for-age** | Reduced | Reduced | Reduced | | **Weight-for-height** | **Markedly reduced (<-2 SD)** | Normal or near-normal | **Markedly reduced** | | **Onset** | Rapid (weeks to months) | Insidious (months to years) | Acute deterioration in chronically malnourished | | **Clinical features** | Wasting, visible ribs, muscle loss | Short stature, proportionate body, normal muscle | Severe wasting + short stature | ### Key Point: Interpretation of This Child's Pattern This child demonstrates: 1. **Reduced height-for-age** (10th percentile) — evidence of prolonged inadequate nutrition 2. **Preserved weight-for-height** (25th percentile) — muscle and fat stores relatively intact 3. **Reduced weight-for-age** — secondary to short stature **High-Yield:** Chronic malnutrition (stunting) results from prolonged inadequate nutrition during critical growth periods, particularly in the first 2–3 years of life. It is largely irreversible after age 3–5 years. **Clinical Pearl:** The relatively preserved weight-for-height distinguishes chronic malnutrition from acute malnutrition. In acute malnutrition, the child appears visibly thin and wasted; in chronic malnutrition, the child is proportionately short but not necessarily thin. ### Why This Pattern Fits Chronic Malnutrition The child's birth weight (2.8 kg) was already low, suggesting intrauterine growth restriction or maternal malnutrition. Continued inadequate feeding (mixed feeding from 6 months in a resource-limited setting) has resulted in failure to achieve normal height velocity, while weight relative to height has been maintained. This is the hallmark of chronic malnutrition.