Babies are typically born with iron stores that last for about six months, after which they need to obtain iron through their diet. Because breastmilk is low in iron and babies may be picky when starting solids, pediatricians often prescribe iron supplements to prevent deficiency until the child is eating a more consistent, iron-rich diet. Always follow your pediatrician's specific advice, as they may recommend blood work at the one-year mark to assess your child’s levels.