title: Cyclical serum 25-hydroxyvitamin D concentrations paralleling sunshine exposure in exclusively breast-fed infants.
mesh_terms: D015652:25-Hydroxyvitamin D 2; D001942:Breast Feeding; D004872:Ergocalciferols / Q000031:analogs & derivatives* / Q000097:blood; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D012621:Seasons; D013472:Sunlight
chemical_list: D004872:Ergocalciferols; D015652:25-Hydroxyvitamin D 2