A one-year-old baby with a fever of 39.5°C should immediately take oral antipyretics, such as ibuprofen and acetaminophen, which should always be available at home. Be prepared to visit the hospital and ask the doctor to help find the cause of the fever and treat it effectively for the cause. Parents should carefully observe and record the baby’s fever pattern, maximum body temperature, accompanying symptoms such as nasal congestion, runny nose, cough, abdominal pain, nausea, fatigue, generalized rash, presence of joint pain, and presence of hand patting on the head. Also note that the baby’s clothing should be reduced appropriately to keep the baby in a cool and comfortable environment, and drink more water appropriately. If the baby’s limbs are cold and accompanied by chills, you can give warm water to soak the hands and feet. If the baby’s limbs are warm and there are no chills, you can use cold towels to apply cold compresses to the head.