There are two main causes of diarrhea in babies after the onset of fever. First, it is possible that indigestion occurs as a result of gastrointestinal tract dysfunction caused by fever, and diarrhea can also occur, and there are often no special abnormalities in the stool routine. Treatment with anti-diarrheal drugs as well as fever-reducing drugs is often more effective. During the period, you also need to eat a light, simple and easy to digest diet, not to eat greasy, cold or hard to digest food, meat and fruit as much as possible; secondly, there may be inflammation of the gastrointestinal tract caused by fever and diarrhea. It may be a bacterial infection or a viral infection, and the stool routine and C-reactive protein should be checked. If there is an elevation of white blood cells and C-reactive protein, it is a bacterial infection. The baby should be treated with antibiotics, such as pediatric cefixime granules. If the fever and diarrhea are caused by a viral infection, the baby should be treated with Four Seasons Anti-Viral Combination or Pediatric Black Cohosh Clear Fever Granules.