An infection with a virus, bacteria, or parasite. Babies can pick up these germs through contact with unclean food or water or when they touch germy surfaces and then put their hands into their mouths. A food allergy or sensitivity to medicines. Drinking too much fruit juice.

Keep your baby hydrated. Keep breastfeeding if you're nursing. ... Ask your pediatrician about electrolyte drinks for babies like Pedialyte. ... Change your baby's diaper often. ... If your little one is eating solid foods, give them bits of foods that may help soothe diarrhea.

Breastfed babies often pass more than 6 stools per day. Until 2 months of age, they may pass a stool after each feeding. But, if stools suddenly increase in number and looseness, suspect diarrhea. If it lasts for 3 or more stools, the baby has diarrhea.