WHO defination of low birth weight is when birth weight is –
**Core Concept**
Low birth weight (LBW) is a critical public health indicator that signifies potential neonatal morbidity and mortality. The World Health Organization (WHO) defines LBW based on the infant's birth weight, which is a key factor in determining the baby's health outcomes.
**Why the Correct Answer is Right**
The WHO defines low birth weight as a birth weight of less than 2,500 grams (5.5 pounds). This definition is based on the understanding that babies with a birth weight below this threshold are at increased risk of various health complications, including respiratory distress, hypoglycemia, and infections. The WHO's definition is widely used globally to identify and address LBW-related health issues.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the WHO does not define LBW as a birth weight of 2,000 grams or less. While babies with a birth weight below 2,000 grams are at even higher risk of complications, the WHO's definition specifically includes babies with a birth weight of less than 2,500 grams.
**Option B:** This option is incorrect because the WHO does not define LBW as a birth weight of 3,000 grams or more. In fact, the WHO's definition specifically excludes babies with a birth weight of 2,500 grams or more.
**Option C:** This option is incorrect because the WHO does not define LBW as a birth weight of 2,500-3,000 grams. While babies with a birth weight in this range may still be at some risk of complications, the WHO's definition specifically includes babies with a birth weight of less than 2,500 grams.
**Clinical Pearl / High-Yield Fact**
The WHO's definition of low birth weight is a critical public health indicator that has significant implications for neonatal care and outcomes. Healthcare providers should be aware of this definition to accurately identify and manage LBW-related health issues.
**Correct Answer:** C. 2,500 grams