My two month old breastfed baby girl has diarrhea. What could have possibly caused it & what should I do?

See doctor. Breastfed infants have stools that can look like diarrhea - they're on the runny side, can be yellow or green, with little "grains" of stuff in them. Not the typical looking stool. However, if you're concerned, you should see your doctor. Especially if your daughter has a fever, is not eating as well, or not acting normally, and has not gotten their 2 mo vaccinations.