## **Core Concept**
Breast milk is a comprehensive source of essential nutrients for infants, including vitamins, proteins, fats, and minerals. However, the concentration of certain vitamins can vary based on the mother's diet and health status.

## **Why the Correct Answer is Right**
Vitamin D is crucial for bone health and immune function. Human breast milk contains relatively low levels of vitamin D, making supplementation often necessary for breastfed infants, especially if the mother has a deficiency. The amount of vitamin D in breast milk is directly related to the mother's vitamin D status.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Vitamin C is present in adequate amounts in breast milk and is essential for immune function and collagen synthesis.
- **Option B:** Vitamin E, an antioxidant, is also adequately provided in breast milk, supporting cellular health and immune function.
- **Option D:** Vitamin K, crucial for blood clotting, is present in lower amounts in breast milk. However, it is well known that newborns receive a vitamin K shot at birth to prevent bleeding.

## **Clinical Pearl / High-Yield Fact**
A key clinical point to remember is that breastfed infants are often recommended to receive vitamin D supplements from the first few days of life to prevent deficiency, especially in regions with limited sunlight or during winter months. The American Academy of Pediatrics recommends vitamin D supplementation for all breastfed infants.

## **Correct Answer:** . Vitamin D