A 4-year-old child with a fever of 39.5 degrees needs to be treated quickly with fever-reducing medication, such as oral ibuprofen suspension or acetaminophen suspension. If the temperature is persistently high or there are repeated cases of high fever, you can repeat the medication after an interval of 4-6 hours, and use the medication no more than 4 times a day. In addition, it is also necessary to combine physical cooling methods, such as using a warm towel to wipe the child’s skin all over the body, especially the armpits, groin, neck, these large blood vessels are more rich in the place, wipe the time can be slightly longer, is conducive to fever, but also can prolong the effect of antipyretic drugs time, reduce the use of antipyretic drugs. When a child’s fever is this high, it is often a bacterial infection or an influenza virus infection that makes the fever so severe. If the infection is influenza, antiviral treatment with oseltamivir is needed. If it is a bacterial infection, antibiotics, such as an intravenous drip of ceftriaxone, may be used.