1. Causes of infant diarrhea 1.1 Improper diet 1.2 Underdeveloped digestion 1.3 Viral infection 1.4 Bacterial infection Improper diet is one of the main causes of infant diarrhea. Since the digestion is not fully developed, the baby\’s ability to digest and absorb food is weak. If the diet is too simple, too greasy or contains