What causes diarrhea in newborn babies? Babies will have many different symptoms in the first few weeks after birth, among which diarrhea is a common problem. Diarrhea can cause discomfort and pain to the baby and cause great distress to parents. So, what causes diarrhea in newborn babies? It will be elaborated from several aspects below. 1. Feeding methods The intestines and stomach of newborn babies are relatively fragile and are easily affected by poor diet and feeding methods. If the mother feeds improperly or the milk powder is not properly formulated, it will cause diarrhea in the baby. For example, mother drinks