Do we explain well how to dose the vitamin D in infants? About two cases of overdose

It seems clear the consensus in the recommendation of the administration of 400 international units of vitamin D per day during the first year of life, in all the healthy children that are breastfed or fed with artificial formula, until they take at least one liter of fortified in vitamin D adapted formula per day. The different commercial presentations that are nowadays available, can conduce to make mistakes, if we don´t take into account the exact concentration of vitamin D per drop or milliliters. We present two cases of lactating children with a vitamin D overdose, due to the misunderstanding of its administration by parents. Despite this, no clinical repercussion happened in both of them.