On the one hand, a 5-year-old baby with recurrent fever of 39℃ should be treated with antipyretic treatment, either oral ibuprofen granules or acetaminophen suspension, with the dosage calculated according to body weight. On the other hand, we should look for the cause of the fever, such as with sore throat and cough to consider respiratory tract infection, if accompanied by vomiting, diarrhea may be acute enteritis or acute gastroenteritis. Most fevers in children are caused by viral infections and are self-limiting. However, if the fever exceeds 48 or 72 hours, pay attention to whether there is a secondary bacterial infection, and it is recommended to go to the hospital for routine blood tests and C-reactive protein, and if necessary, mycoplasma antibodies. The higher the fever, the more serious the disease. It is important to avoid dehydration when the fever does not go away, to replenish enough fluids, to drink fruit juices, to eat a lighter diet, and not to overuse antipyretics, because the potential benefit of fever is that it can help delay the growth and reproduction of certain bacteria and viruses.