## Core Concept
The classification of birth weight in newborns is crucial for assessing their health and development. Birth weight is categorized into several groups, including very low birth weight (VLBW), which is a significant predictor of neonatal and infant mortality.

## Why the Correct Answer is Right
The correct classification for a very low birth weight child is less than 1500 grams. This classification is critical because VLBW infants are at a higher risk for complications and require specialized care. The World Health Organization (WHO) and other medical guidelines use such classifications for monitoring and managing newborn health.

## Why Each Wrong Option is Incorrect
* **Option A:** Less than 2500 grams - This is the definition for low birth weight, not very low birth weight.
* **Option B:** Less than 2000 grams - While closer, this is not the standard cutoff for very low birth weight.
* **Option D:** Less than 1000 grams - This is actually the definition for extremely low birth weight.

## Clinical Pearl / High-Yield Fact
A key point to remember is that very low birth weight infants (less than 1500 grams) have a higher risk of complications such as respiratory distress syndrome, intraventricular hemorrhage, and infections. Early recognition and appropriate management are critical for improving outcomes.

## Correct Answer: B. Less than 1500 grams.