1. Causes of Diarrhea Diarrhea is caused by bacterial, viral or parasitic infection in the intestines. It may also be caused by improper diet or other reasons. Understanding the causes of diarrhea can help us better prevent and treat it. 2. Symptoms of diarrhea in babies When babies have diarrhea, they will have symptoms such as diarrhea, abdominal bloating, and abdominal pain. In addition, discomfort such as fever and vomiting may also occur. 3. How to prevent your baby from having diarrhea. Prevention is more important than treatment. The following points can help you prevent your baby from having diarrhea: keep clean and hygienic, and avoid eating expired food and unsterilized fruits.