Key concept: Anthropometric indices in child nutrition assessment:
- Height-for-age: Reflects linear growth; reduced values indicate stunting, a marker of chronic (long-term) malnutrition
- Weight-for-height: Reflects body mass relative to height; reduced values indicate wasting, a marker of acute malnutrition
- Weight-for-age: Composite indicator reflecting both acute and chronic malnutrition
In this question, height-for-age $<$ -2 SD =
stunting = evidence of prolonged, chronic undernutrition over months to years. This is distinct from wasting (acute or recent deficiency).
The anganwadi teacher's finding of low height-for-age therefore points to
chronic malnutrition.
\[\boxed{\text{Chronic malnutrition}}\]