Recurrent fever in young children usually cannot exceed 1 week, and the exact duration is related to the cause of the fever and cannot be generalized. Recurrent fevers in young children are commonly associated with common colds and viral infections, with common colds generally improving in 3-5 days and viral infections being self-limiting and lasting for about 1 week. The duration of fever varies from one cause to another, and if the duration of fever exceeds the corresponding duration, the original disease needs to be re-evaluated and diagnosed. In common viral infections, fever usually does not last more than 3 days if it occurs. If the fever is recurrent for more than 3 days, the possibility of combined bacterial or mycoplasma infections should be considered and antibiotic treatment can be administered under medical supervision. If the symptoms do not resolve or persistently worsen, other immune diseases such as herpes virus infection or Kawasaki disease may be present and should be diagnosed and treated promptly. If the baby’s fever is below 38.5℃, physical cooling, such as ice packs and warm water wipes, can be taken as appropriate, while fever over 38.5℃ should be properly treated with antipyretic drugs under the guidance of a doctor.