Vitamin D Deficiency Puts 40% of U.S. Infants and Toddlers At Risk

Gordon said it's very difficult to consume too much vitamin D, so she recommends vitamin D supplements for breast-feeding infants and lactating mothers. She also recommends a multivitamin containing vitamin D for older children.

Taylor wasn't as convinced about the need for routine supplementation, however. "I think that more research is needed before routine vitamin D supplementation is recommended for all children," he said.

More information

To learn more about vitamin D, visit the government's Office of Dietary Supplements.