A baby’s fever may be due to upper respiratory tract infection, gastroenteritis and other conditions. 1. Upper respiratory tract infection: if the baby is upper respiratory tract infection may appear fever recedes again, usually the baby will also appear sneezing, runny nose, coughing and other symptoms. 2. Gastroenteritis: gastroenteritis may also make the baby fever recede and fever, usually because of unhygienic eating and other conditions lead to the child in addition to repeated fever is usually accompanied by nausea, vomiting, diarrhea and other symptoms. Simply based on the baby fever and fever can not be accurately determine the cause, it is recommended to go to the hospital in a timely manner, improve the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.