The exact time when a child must go to the hospital with a fever depends on the child’s own situation and should be analyzed on a case-by-case basis. Fever is one of the common manifestations of childhood illness, mainly caused by infection. If the child’s temperature does not exceed 38.5°C, he or she can be closely observed at home, using physical cooling methods such as antipyretic patches or warm water baths to help lower the temperature. If the child’s body temperature is above 38.5℃, he or she is in a serious condition such as depression, drowsiness or difficult to wake up, breathing is accelerated with wheezing sounds, or even unable to drink or has convulsions, it is recommended that the child go to the pediatric department or emergency room of a regular hospital in a timely manner to understand the status of the infection through routine blood tests and C-reactive protein, and then carry out targeted treatment after clarifying the cause. During the period of fever, children should pay attention to drink more water, maintain a regular diet, eat more light porridge, and avoid eating greasy, spicy and stimulating food.