Fever caused by the common cold in children usually lasts about 3-5 days. Fever caused by epidemic virus is usually around 7 days, and the cycle can be shortened by taking oral medication. When fever is present, you need to drink more water, take rest, take vitamin C supplements, prevent cross-infection, and be alert to dehydration and convulsions caused by high fever. If the fever in children does not exceed 38.5°C, physical cooling can be done by applying ice packs to the forehead and neck. Or you can take warm water baths, both can play a role in reducing the body temperature. If the body temperature exceeds 38.5℃, antipyretic and analgesic drugs such as ibuprofen can be used, which can play a rapid role in reducing fever.