Level 1: What is baby diarrhea? Baby diarrhea refers to an increase in the number of infants and young children\’s bowel movements, a small amount of stool each time, and a watery or thin mushy stool. This condition is usually caused by intestinal infections, food allergies, indigestion, etc. If the baby does not have frequent diarrhea, is in good condition, and has no other symptoms such as fever and diarrhea, he can be observed at home for a period of time. However, if the condition is serious or lasts for a long time, you should seek medical treatment in time. Level 2: Why does the baby have diarrhea? 1. Intestinal infection: Intestinal infection caused by bacteria, viruses, parasites, etc.