The normal body temperature (generally axillary temperature) of children is between 36.0-37.3°C. Pediatric fever is divided into four levels: low fever of 37.5-38°C; moderate fever of 38.1-39°C; high fever of 39.1-41°C; and ultra-high fever of more than 41°C. Children’s body temperature 38.5 ℃ more than the normal body temperature, the degree of moderate fever, not high fever, but the need to evaluate the severity of the disease in the context of the actual situation. 1, age difference: under six months, especially newborns (within 28 days of daytime age), regardless of the degree of fever, once the fever, you need to promptly consult a doctor. 2. Difference in mental condition: If the child is in good spirits and his diet is not affected at 38.5℃, there is generally no need to worry too much and treatment such as symptomatic antipyretic can be given; however, if the child has poor mental response or a past history of febrile convulsions or symptoms such as violent cough, vomiting and diarrhea, he needs to be sent to the doctor promptly. 3, the body temperature exceeds 38.5 degrees need to give the baby antipyretic treatment. In conclusion, fever is a useful protective mechanism for the body to fight against the invasion of pathogenic microbial infections, but fever and the severity of the disease are not necessarily proportional. If a child has a high fever, a prolonged fever or other complications, regardless of the degree of fever, he or she needs to be diagnosed and treated at the hospital.