Prevalence and determinants of vitamin D deficiency in infants and toddlers in the Netherlands: a pilot study

Background Little is known of the vitamin D status of young infants and toddlers and its determinants in West Europe. The prevalence and determinants of vitamin D deficiency of children aged 6–48 months in the centre of the Netherlands (52°N) is investigated. Methods In a cross-sectional population study, randomly recruited infants and toddlers (n = 150) were studied using an online questionnaire and a physical examination either in late summer (n = 52) or in late winter (n = 98). Vitamin D analysis was performed by capillary blood sampling using dried bloodspots plus LC-MS/MS. Results In late winter, 32% of the children were vitamin D deficient (