Three months baby fever 38.5 ℃, you can first choose the physical cooling method to make the body temperature drop. The physical cooling method is to use a warm towel to wipe the child’s forehead, palms, feet, armpits, groin and other parts of the body, if the physical cooling temperature can not fall, you can take oral antipyretic drugs, antipyretic drugs recommended to choose acetaminophen. After taking antipyretic drugs, you should give your child some warm water to make him sweat, which is good for reducing fever, but do not sweat too much to avoid hypothermia or dehydration. In addition, parents should be reminded that three-month-old babies are young and prone to serious illnesses such as pneumonia and sepsis. Parents are advised to take their children to the hospital promptly for routine blood, urine, C-reactive protein, chest X-ray and other related examinations, and to provide targeted treatment according to the detected causes.