There are many reasons for fever, some babies will have fever for a day or two, but some babies will have fever repeatedly after the fever is gone, then this situation needs to clarify the cause of the fever and must take some relevant measures for treatment. There are many reasons for the recurrence of fever in babies, from the pathogenic side there are bacteria, viruses, mycoplasma, etc. may cause recurring fever in babies, you can help clarify the pathogen through blood tests, C-reactive protein, mycoplasma antibodies, etc., and give targeted anti-infection treatment according to the pathogen. There are both infectious and non-infectious diseases in terms of etiology. Common infectious diseases in children, including upper respiratory tract infections, bronchitis, pneumonia, urinary tract infections, central nervous system infections, etc., may cause recurrent fever in babies, and doctors will make judgments based on the accompanying symptoms and auxiliary examination results of babies. There are also some non-infectious diseases such as Kawasaki disease and immune diseases that may cause recurrent fever in babies, which are relatively rare, but if the fever is prolonged and anti-infective treatment is not effective, these causes should be considered. If your baby’s fever persists above 38.5 degrees, it is advisable to use antipyretic drugs, and at the same time, use antipyretic drugs with physical cooling methods, so that the baby’s fever can be reduced better. If the fever persists, it is advisable to go to the hospital for examination and treatment.