If a child’s fever suddenly goes up and then goes down, and if it is caused by too much clothing or too thick a blanket that causes the child’s temperature to rise transiently, then no treatment is needed, and the child’s parents should keep an eye on him or her to see if he or she is getting better. If the fever is caused by food accumulation or cold, it needs to be treated in time for the cause. 1. Do not need treatment: children suddenly fever and suddenly well, if because of too much clothing or quilt and other external environmental factors caused by children’s transient temperature rise, and no other symptoms, generally do not need special treatment, pay attention to reduce clothing and bedding can be. 2. Need for treatment: If the child suddenly fever and suddenly well, but accompanied by other symptoms, such as coughing, coughing sputum, abdominal pain, dizziness and other symptoms, need to consult a doctor in a timely manner, according to the cause of the disease to give targeted treatment, the body temperature will be fluctuations in accordance with the condition, pay attention to the monitoring of body temperature. Children’s thermoregulatory function is not yet perfect, parents need to pay attention to children’s mental status, if there is any discomfort, consult a doctor in time.