Natures Aid Vit D3 400iu Drops - Infant & Children 50 Ml helps in the absorption of calcium and supports healthy bone development in children. It also supports healthy muscle function as well as supporting the normal functioning of the immune system in children. To help you meet your child's vitamin D needs, we've created our award-winning Vitamin D3 Mini Drops. These are vitamin drops designed for breastfed newborns, infants, and children, formulated to provide them with the suggested 400iu vitamin D daily.