4 months baby fever 39 ℃, need to actively reduce fever, reduce discomfort, at the same time need to clarify the cause of fever and treatment. Fever is a common symptom of children, fever baby can appear general discomfort, breathing heart rate accelerated, etc., 4 months baby neurological function is not well developed, there may be abnormal brain cell discharge, convulsions, etc., therefore, it is recommended to actively symptomatic antipyretic, often use acetaminophen, according to the baby’s body weight, under the guidance of the physician to give the appropriate dose of drugs. At the same time, you can moderately reduce clothing, use warm water to wipe the forehead and other ways to increase heat dissipation. In addition, identifying the cause of the fever and treating the symptoms is also a priority. Causes may include acute upper respiratory tract infections, intracranial infections, and tumors. If your baby has recurrent fevers, or if the fever does not go away, it is recommended that you actively seek medical attention and have your baby evaluated and treated by a specialist.