It is normal for a child to have 4 bowel movements a day if the child simply has a bowel movement with no other abnormalities. If the child is accompanied by other uncomfortable symptoms, it is not normal. 1. Physiological phenomenon: Generally speaking, if the child has no discomfort and simply wants to have a bowel movement without other abnormal and uncomfortable symptoms, it is a normal physiological phenomenon, which is related to daily dietary habits and individual gastrointestinal function, no need to be overly concerned about it, and observation can be done. 2. Pathologic causes: (1) Rotavirus infection: rotavirus infection is one of the common causes of diarrhea in young children, it is an acute gastrointestinal infectious disease and every infected person is a source of infection. The main manifestations are increased frequency of stools (usually between 5 and 10 times a day), the appearance of eggdrop soup-like stools, which may be accompanied by fever (usually between 37.9°C and 39.5°C) and other symptoms. (2) Irritable bowel syndrome: the cause of irritable bowel syndrome is not clear, and its typical symptoms are abdominal pain, diarrhea (usually 3~5 times/day), and stools with mucus, which are often in the form of thin paste and other symptoms. If a child has diarrhea 4 times a day, accompanied by any discomfort, it is recommended to seek medical attention as soon as possible, with the help of a doctor to identify the cause of the disease, and follow the doctor’s instructions for targeted treatment, do not blindly use their own medication.