Randomized study of sunshine exposure and serum 25-OHD in breast-fed infants in Beijing, China.

The hypothesis that breastfed infants in Beijing, China, have low vitamin D status and that sunshine exposure increases serum 25-hydroxyvitamin D (25-OHD) concentrations was tested in a randomized prospective study involving 42 healthy infants 1-8 months of age. 24 controls were exposed to the usual amount of sunshine, while the 18 cases were provided… (More)