The causes of fever in children include colds, meningitis, urinary tract infections and so on. 1. Cold: Influenza or common cold caused by viral or bacterial infections will proliferate viruses or bacteria in the body and cause fever in children, which may be accompanied by cough and gastrointestinal symptoms. 2. Meningitis: Meningitis is mostly caused by viral or bacterial infection, which affects the thermoregulatory center and leads to fever. 3. Urinary tract infection: due to the untimely change of diapers, causing bacteria upstream infection of the urinary tract, bacterial proliferation and production of harmful substances causing fever, mostly in children under 1 year old. Fever is not a specific symptom, we should closely observe the child’s condition, if there is any abnormality, send to the doctor in time.