Fever in children is not time-specific, but it can be triggered by low activity at night, lowered resistance, and lowered temperatures. Children’s fever does not have time characteristics, fever is the body’s immune system self-protection performance. During the day the child’s activity is relatively large, blood circulation is fast, resistance is strong, and the daytime temperature is high, are to reduce the cause of fever. At night, the temperature is low, especially when the temperature difference between day and night is relatively large, the child is very easy to get cold, resistance to decline, causing the symptoms of infection in the body, the body stress symptoms of fever. After the child has a fever, timely physical cooling, clear cause, once the temperature is greater than 38.5 ℃, follow the doctor’s instructions oral antipyretic medication, if necessary, take the child to the hospital.