Baby diarrhea after fever is considered to be the emergence of gastrointestinal cold, may also be gastrointestinal dysfunction, acute gastroenteritis and other factors triggered. 1. gastrointestinal cold, if the baby has a gastrointestinal cold, may lead to fever, at the same time the digestive tract function decline, may lead to diarrhea. 2. Gastrointestinal dysfunction, the baby fever body metabolism slows down, gastrointestinal peristalsis is affected, may lead to gastrointestinal dysfunction, so diarrhea symptoms will occur. 3. Acute gastroenteritis, if the baby has acute gastroenteritis, the pathogen invasion will appear after the fever diarrhea symptoms. Baby fever diarrhea, there may be other reasons, 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.