There is no such thing as the best treatment for a child with a fever of 40 degrees. Oral antipyretics are usually needed to lower the temperature, assisted by physical cooling therapy, etc., and at the same time to find the specific cause of the cause of treatment, to promote a speedy recovery. 1. Oral antipyretics to lower the temperature: it is recommended that parents give their children medications with antipyretic and analgesic effects as soon as possible under the guidance of a doctor to help lower the body temperature, such as acetaminophen oral solution or ibuprofen suspension, and so on. 2. Physical hypothermia treatment: while medication is used to lower the temperature, parents are advised to give their children auxiliary physical hypothermia treatment, such as warm water bath, drink more warm water to promote heat dissipation, and so on. 3. Find the cause of the cause of treatment: it is recommended to immediately find the cause of fever, if it is caused by bacterial infection, it is recommended to follow the doctor’s advice to take amoxicillin and other antibiotics to ease; if it is caused by viral infection, it is recommended to follow the doctor’s advice to take ribavirin particles to ease; mycoplasma infections can be followed by the doctor’s advice to take azithromycin and so on to ease. A child with a fever of 40 degrees is recommended to consult a doctor in a timely manner, while remembering to closely observe the child’s reaction to the medication during the period of time, the symptoms of discomfort as soon as possible and then consult a doctor to ensure that the child’s safety with the medication.