The baby’s fever returns after two days of fever reduction, it may not be symptomatic medication, or pneumonia, enteritis, autoimmune diseases and other disease factors related. 1. No symptomatic use of drugs: baby fever has more causes, if there is no clear cause of the situation, the use of drugs for the baby, may lead to inflammation can not be completely eliminated, the recurrence of the situation. 2. Disease factors: baby fever after two days of fever, may be related to the primary disease is not cured, common diseases are pneumonia, enteritis, autoimmune diseases, etc., and will be accompanied by other adverse reactions, such as coughing, diarrhea, abdominal pain and so on. The baby fever after two days and then again, there may be other reasons, it is recommended to go to the hospital in a timely manner to carry out relevant examinations, to clarify the cause of the disease and then actively treat the symptoms.