A five-year-old baby with a fever of 39 degrees Celsius is classified as hyperthermia, and a temperature above 38.5 degrees Celsius requires oral antipyretic medication, which can be given orally as acetaminophen suspension or ibuprofen suspension, with caution for asthma or ulcer disease, at a dose of 5-10 mg per kg of body weight per time, and if there is vomiting that can’t be taken orally, or intramuscular injections of anandamide at a dose of 5-10 mg per kg of body weight per time, which is not used at this time, because of the large side effects. If you have vomiting and cannot take it orally, you can also take intramuscular anandamide 5-10mg per kg of body weight, because of the side effects, and try not to use it, or use anandamide enema 15-20mg per kg of body weight or acetaminophen suppositories 5-10mg per kg of body weight, and if it is less than 38.5 degrees Celsius, you can give physical cooling, which is often used as an ice bag pillow, fever-reducing patches, and external rubbing of the axillae, head, and inguinal area with lukewarm water, and so on.