K.S.
I also highly recommend probiotics. You can buy them over the counter at any pharmacy. I'd ask the pharmacist for his/her recommendation on which one to get. I keep some in the house at all times and mix it in my daughter's milk when she has diarrhea. My pediatrician first recommended it to me when my daughter had a stomach bug; he specifically recommended it to help with the diarrhea, which lingered for awhile after her other symptoms had passed.