Four-month-old baby fever, if the temperature exceeds 38.5 ℃, you can take acetaminophen suspension or ibuprofen suspension, these two drugs are high safety, antipyretic effect, taking drugs at the same time remember to give the baby a small amount, many times to drink warm water. If the body temperature is lower than 38.5 ℃ without taking antipyretic drugs, give the baby physical cooling, such as forehead antipyretic paste, or use warm water to do the baby’s whole body wipe, focusing on the neck, armpits, elbow fossa, groin, popliteal fossa and other large blood vessels stay, or give the baby a warm bath, are conducive to the recovery of the baby’s body temperature. Remind parents whether the baby has a low or high fever, remember to give the baby more warm boiled water.