#AskTheExpert my daughter is 18 months old. she used to have nan pro since 4 months. after 18 months I started feeding her nan pro 4. bt she can't digest it. her stool is also become black. what should I do? shall I continue with nan 3? she only have nan 3 times at night

A. Babies who drink iron-fortified formula may have black poop regularly in their diapers, and this is totally normal, too. Iron ingredients in their formula causes poop to turn a dark black color. Cases, where dark black poop is not normal, is if your baby does not drink iron-fortified formula.