Over the past few years, we have become increasingly aware of the health importance of vitamin D. It turns out that many kids do not get enough from their nutrition or sunlight exposure. A new study in the journal Pediatrics reports that 1 in 5 U.S. children do not get enough vitamin D. Breastfed infants and children with darker skin are particularly at risk. As many as 80% of Hispanic children and 90% of African American children have low vitamin D levels. We now recommend a vitamin D supplement for all breastfed infants, as well as all children over 12 months of age. Most over-the-counter children's multivitamins contain the recommended level of 400 units of vitamin D per day.