**Core Concept**
UNICEF and WHO recommend exclusive breastfeeding for the first 6 months of life for all infants, regardless of their HIV status. However, for HIV-infected mothers, the risk of mother-to-child transmission (MTCT) of HIV through breastfeeding is a significant concern. The World Health Organization (WHO) has provided guidelines to minimize this risk.

**Why the Correct Answer is Right**
The correct approach for HIV-infected mothers is to exclusively formula-feed their infants for the first 6 months of life, as recommended by the WHO. This reduces the risk of MTCT of HIV through breastfeeding. Rapid weaning is also recommended to minimize the duration of breastfeeding, which further reduces the risk of transmission. Breastfeeding for 1 year or 4-6 months followed by weaning is not recommended as it increases the risk of MTCT of HIV.

**Why Each Wrong Option is Incorrect**
* **Option A:** Breastfeeding for 4-6 months then start weaning is not recommended as it increases the risk of MTCT of HIV.
* **Option B:** Breastfeeding for 1 year then start weaning is not recommended as it increases the risk of MTCT of HIV.
* **Option D:** Breastfeeding for 6 months & then rapid weaning is not recommended as it is not in line with the WHO's exclusive formula-feeding recommendation for the first 6 months.

**Clinical Pearl / High-Yield Fact**
The WHO recommends exclusive formula-feeding for the first 6 months of life for HIV-infected mothers to minimize the risk of mother-to-child transmission of HIV.

**Correct Answer:** C. Exclusively top feeding.