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The aim of this study was to estimate the prevalence of vitamin D deficiency among healthy infants and toddlers, as well as its associated factors, in Irbid, Jordan.A total of 275 subjects (136 infants and 139 toddlers) aged 6–36 months participated in this study. Information concerning sociodemographic characterastics and early feeding patterns was collected using a self–guided questionnaire. Plasma vitamin D, calcium, phosphorous, and alkaline phosphatase activity were measured.The prevalence of vitamin D deficiency was 28% (16.7% for severe vitamin D deficiency and 11.3% for vitamin D deficiency) and vitamin D insufficiency was 28.4%. Plasma calcium and alkaline phosphatase levels showed no correlation with the vitamin D status of the study population. For both age groups, a significant association was found between vitamin D status and sun exposure (P < 0.001). A significant association between infant feeding practices and vitamin D status was found (P < 0.001). Infants who were exclusively breast–fed had higher risk for vitamin D deficiency and vitamin D insufficiency than those who were bottle–fed. Multivariate logistic regression analyses results showed that female sex, low sun exposure and exclusive breast–feeding were the main determents of vitamin D levels.The prevalence of vitamin D deficiency is considered to be high among northern Jordanian infants and toddlers. Sun exposure of less than 30 min daily and exclusively breast–feeding are the main factors for developing vitamin D deficiency.