Three-year-old baby diarrhea with foam may be intestinal infection, indigestion and so on. 1. Intestinal infection: generally babies have diarrhea, stool with foam, usually intestinal infection is more likely, mainly intestinal invasion by pathogens, the child will have fever, fatigue, diarrhea, watery stool and other symptoms. 2. indigestion: when three-year-old baby indigestion, food can not be digested and absorbed in a timely manner, intestinal bacteria decomposition of food gas production will have a certain increase, and then there may be diarrhea, defecation of foamy material phenomenon. Three-year-old baby diarrhea with foam may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.