What is the recommended daily intake of vitamin D for infants?

The recommended daily intake of vitamin D for infants is 400 IU. This amount is advised to help prevent rickets and support healthy bone development. Infants, particularly those who are exclusively breastfed, may not receive sufficient vitamin D from breast milk alone, as it typically provides only small amounts of this essential nutrient.

The guideline of 400 IU aligns with recommendations from health organizations such as the American Academy of Pediatrics, which emphasizes the importance of ensuring infants receive adequate vitamin D to promote proper growth and development. This intake is crucial, especially during the first year of life, when bones rapidly develop.

The other options indicate higher dosages that are generally not needed for infants. While older children and adults may require increased doses due to higher dietary needs or absorption challenges, for infants, 400 IU sufficiently meets the requirements for healthy development without the risk of toxicity associated with higher intakes.