A three-year-old baby at 38.5°C is considered moderately hot and needs to be treated with warm water baths, antipyretic medication, and a visit to the pediatrician. A child’s normal body temperature is between 36~37.2℃, more than 37.3℃ is considered fever. Fever is categorized into 4 degrees, low fever: 37.3~38℃, medium fever: 38.1~39℃, high fever: 39.1~40℃, and super high fever: over 40℃. Different treatment for different degrees of fever. Physical cooling can be given for low and moderate fever by wiping the armpits, forehead and groin with a warm towel, but do not use alcohol for wiping. If the temperature exceeds 38.5℃, you need to give ibuprofen or acetaminophen antipyretics to reduce fever. At the same time, a visit to the pediatrician may be necessary to complete tests such as routine blood work and chest X-rays to clarify the presence of bacterial infection and the need for antibiotics and other medications.