A child with a fever of 38.5°C is a moderate fever, and whether it is serious or not depends on the specific situation and cannot be generalized. If the temperature is 38.5℃ caused by a cold, pay attention to physical and medication cooling, which usually does not lead to serious problems. Because the cold is a self-limiting disease, it usually heals itself in a week. If it is a specific disease, such as a central infection, i.e. viral encephalitis or bacterial encephalitis, accompanied by fever symptoms, and the temperature continues to rise, the situation is more serious and may cause brain damage, which requires attention and must not be delayed. Children with a fever of 38.5°C need physical therapy and medication. If the fever does not subside, the child should be seen by a pediatrician to avoid febrile convulsions.