[Problems posed by vitamin D in early childhood].

Introduction: More and more functions related to vitamin D and more pathologies related to its deficiency are known. The deficiency that exists in vitamin D is known at all ages, sexes and throughout the world. But beyond the existing deficiencies in each population group, in this article we intend to analyze how the nutritional situation of this vitamin in pregnant women and during lactation can have influence on the future health of their offspring. Vitamin D deficiency during pregnancy can be associated with maternal (preeclampsia, gestational diabetes, premature birth), fetal and neonatal complications (low birth weight, late hypocalcemia, nutritional rickets and possible relationship with future development of diseases such as bronchiolitis, asthma, type 1 diabetes, multiple sclerosis). During breastfeeding, these conditions can be promoted in the child and there is also a higher risk of depression and sleep disorders later. Therefore, supplementation is recommended in these vital stages.