After discovering that a kitten has diarrhea, it is necessary to fast, and then buy probiotics for the kitten to take. If the kitten has severe diarrhea, you can buy pediatric antidiarrheal medicine for treatment. The gastrointestinal tract of kittens is relatively fragile and prone to symptoms of diarrhea and soft stools. Owners can prepare digestible food for kittens in their diet to avoid diarrhea caused by gastrointestinal indigestion.