Black feces after fever may be physiological normal feces, or may be caused by bleeding due to gastrointestinal diseases, etc. It is recommended to consult a doctor to clarify whether it is normal or not. Normal feces in infants and young children are mainly yellowish brown, yellow or golden yellow in color. Black feces may be caused by the addition of animal liver or animal blood products to complementary foods. This change is not related to pathologic factors such as fever, and usually does not require special intervention and can be restored by suspending the consumption of such foods. There are many causes of fever in babies, and if it is due to gastrointestinal diseases such as gastroenteritis, perforated gastrointestinal ulcers and bleeding, you need to be alert to the possibility that the black stools are due to gastrointestinal bleeding, and because of the small blood volume in infants and young children, bleeding can easily lead to hemorrhagic or infectious shock, and immediate intervention is needed. For unexplained fever and black stools, it is recommended to go to the hospital in a timely manner to determine whether the black stools are due to foodborne causes or diseases, and to provide timely and targeted treatment.