For the baby fever 38.9 ℃ degrees fall asleep there is no question of whether it will burn, may be due to elevated body temperature convulsions, or aggravation of the condition, etc., need to be analyzed on a case-by-case basis. The baby fever 38.9 ℃, belongs to the moderate fever, such children fall asleep does not exist whether the problem will be burned out, there may be no timely symptomatic fever appeared brain cells abnormal discharge, causing convulsive symptoms, but also may be due to the diagnosis of untimely, did not clarify the cause of fever and treatment, the condition aggravated, such as the poor mental response, then the risk is higher. For babies whose causes have been identified and treated, the above phenomena during the course of the disease are part of the normal development of the disease, and close monitoring of the body temperature and response during sleep is sufficient; if the body temperature gradually drops to normal and the response is still good, then the risk is lower. Therefore, it is recommended to consult a specialist for evaluation and appropriate intervention.