The causes of recurrent fever in babies may be related to infectious or non-infectious diseases. 1. Infectious diseases: the more common pathogens are bacteria, viruses, molds, chlamydia, mycoplasma and so on, these pathogenic microorganisms are very easy to cause the baby’s fever to recur. 2. Non-infectious diseases: non-infectious diseases can also make the baby fever recurring, such as connective tissue diseases, blood system diseases, Kawasaki disease, infectious mononucleosis, tumors, etc., can cause recurrent fever. The baby’s fever repeatedly does not go away, 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.