## **Core Concept**
The World Health Organization (WHO) defines low birth weight (LBW) based on the baby's weight at birth. Low birth weight is a significant indicator of a newborn's health and potential risks. It is crucial for identifying infants who may require special care.

## **Why the Correct Answer is Right**
The correct answer, , is based on the WHO's definition of low birth weight. According to the WHO, a newborn with a birth weight of less than 2500 grams is considered to have a low birth weight. This definition is widely used globally to assess and monitor the health of newborns.

## **Why Each Wrong Option is Incorrect**
- **Option A:** If this option is not , then it does not align with the WHO's specified cutoff for low birth weight.
- **Option B:** Similarly, if this option does not match , it is incorrect based on the WHO's definition.
- **Option D:** If this option provides a higher or lower weight than , it does not accurately reflect the WHO's criteria for low birth weight.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that low birth weight is a critical factor in neonatal health. Babies with low birth weight are at a higher risk for various health complications. The WHO's definition of less than 2500 grams for low birth weight is essential for public health monitoring and intervention strategies.

## **Correct Answer:** . 2500 grams.