Is There Any Relationship between Vitamin D Deficiency and Gross Motor Development in12-Month-Old Children?

we aimed to estimate possible relationship between vitamin D deficiency and gross motor developmental milestones in Iranian children. In this cross sectional study, 186 one-year old healthy children referring to one children hospital in Tehran were studied. The gross motor developmental milestone of children and their serum vitamin D concentration were evaluated. A total of 186 children, males 92 (49.5%) were studied. 24 children (12.9%) could sit, 40 (21.5%) could stand and 122 (65.6%) could walk. Vitamin D was sufficient in 148 children (79.6%), insufficient in 32 (17.2%) and deficient in 6 (3.2%).  Sufficient vitamin D was significantly correlated with walking ability (p<0.001, OR=3.9, 95%CI=1.9-8.4).  Considering the significant correlation between vitamin D deficiency and gross motor developmental milestones in this population of children, it can be recommended that children referring with gross motor developmental delay need to be thoroughly evaluated for vitamin D deficiency.