2-year-old baby fever for a few days keep recurring to the hospital for examination, to clarify the cause of fever, mainly blood routine, C-reactive protein, calcitoninogen and other inflammatory indicators. If the white blood cells, neutrophils or C-reactive protein, calcitoninogen increased, suggesting the presence of bacterial infection, need to give the baby antibiotics for treatment. If these inflammatory indicators are not increased, most of them are caused by viral infections, you can give your baby oral heat and detoxification drugs, such as busulfan, compound ichthyocarpine, etc., because viral infections are self-limiting, and can be cured by themselves after a certain period of time. In addition, you need to give your baby a chest X-ray or lung CT to rule out lung infections, and you need to be hospitalized and given antibiotics as well as symptomatic treatment.