**Core Concept:** Exclusive breastfeeding is the practice of providing only breast milk to an infant without any additional food or drink, including water, until the baby is at least 6 months old. It continues until the baby is approximately 2 years old or beyond, based on the World Health Organization (WHO) recommendations.

**Why the Correct Answer is Right:** According to the World Health Organization (WHO), exclusive breastfeeding should be maintained during the first 6 months of a baby's life, after which time complementary feeding should be introduced alongside breastfeeding until the child is at least 2 years old. This recommendation is based on the benefits of breastfeeding for both the child's health and cognitive development, as well as the mother's health and postpartum recovery.

**Why Each Wrong Option is Incorrect:**

A. **Incorrect because it only addresses the duration up to 6 months without considering the continuation of breastfeeding along with complementary feeding until 2 years of age.**

B. **Incorrect because it refers to September 2011, an outdated date. The correct answer is based on WHO guidelines, not a specific year.**

C. **Incorrect because it only addresses the duration up to 6 months without considering the continuation of breastfeeding along with complementary feeding until 2 years of age.**

D. **Incorrect because it refers to September 2011, an outdated date. The correct answer is based on WHO guidelines, not a specific year.**

**Clinical Pearl:** Following the WHO recommendations ensures that breastfeeding benefits are maximized for both the child and mother. These benefits include reduced infant morbidity and mortality, improved cognitive and psychosocial development, and reduced maternal risk of breast and ovarian cancers. Additionally, the introduction of complementary feeding at 6 months and continued breastfeeding until 2 years of age promotes adequate nutrient intake for the child and supports overall growth and development. It is crucial for medical students and healthcare professionals to be familiar with the latest guidelines when providing advice or counseling to mothers regarding breastfeeding practices.