During a school health screening in rural India, two 6-year-old children are identified with stunting (height <5th percentile). Child A has normal weight-for-height and normal developmental milestones. Child B has low weight-for-height and delayed motor milestones. Which anthropometric feature best distinguishes chronic malnutrition from acute malnutrition in these children?

Explanation

## Acute vs. Chronic Malnutrition: Anthropometric Discrimination ### Core Distinction **Key Point:** Weight-for-height (wasting) reflects acute/recent malnutrition, while height-for-age (stunting) reflects chronic/prolonged malnutrition. These two indices are the primary discriminators. ### Anthropometric Classification Table | Parameter | Acute Malnutrition (Wasting) | Chronic Malnutrition (Stunting) | Combined (Stunting + Wasting) | |---|---|---|---| | **Height-for-Age** | Normal | **Low** | **Low** | | **Weight-for-Height** | **Low** | Normal | **Low** | | **Onset** | Recent (weeks to months) | Prolonged (months to years) | | **Reversibility** | Rapid with intervention | Slower; some permanent effects | | **Clinical Signs** | Visible wasting, loose skin, muscle loss | Short stature, delayed milestones | | **Example** | Child with recent diarrhea/infection | Child A in the stem | ### Applied to the Stem **Clinical Pearl:** Child A (normal weight-for-height, normal milestones) = **chronic malnutrition (stunting)**—height is low but weight is proportionate to height, indicating long-standing inadequate nutrition during critical growth periods. Child B (low weight-for-height, delayed milestones) = **acute-on-chronic malnutrition**—both wasting and stunting present, indicating recent deterioration superimposed on chronic undernutrition. ### High-Yield Mnemonics **Mnemonic:** **W-H-A** - **W**eight-for-**H**eight = **A**cute malnutrition (recent) - **H**eight-for-**A**ge = chronic malnutrition (old) ### Why Other Indices Fail **Warning:** BMI and mid-upper arm circumference are useful for overall nutritional assessment but do NOT specifically distinguish the *timing* (acute vs. chronic) of malnutrition. Head circumference is typically spared in both acute and chronic malnutrition unless severe. **Tip:** In field screening, always plot both height-for-age and weight-for-height on WHO growth charts. The pattern of deviation tells you the nutritional history.