In a cross-sectional study of 380 healthy infants and toddlers by researchers at the Children’s Hospital Boston, 12% were found to be vitamin D deficient and 40% were found to have less than optimal vitamin D levels. Predictors of vitamin D deficiency included: breastfeeding without supplementation among infants, and lower milk intake among toddlers. The authors conclude, "Suboptimal vitamin D status is common among otherwise healthy young children."
Source: Arch Pediatr Adolesc Med, 2008;162(6): 505-12
