A body temperature of 37.9 degrees is not normal and is a mild fever. Whether the temperature is measured in the armpit, mouth or anus, 37.9 degrees is greater than the normal body temperature range. If you feel uncomfortable at this time, you can use Chinese medicine to reduce fever, such as antelope and goat’s horn granules, goujiao and clear fever granules or cold and fever granules. If it is not very uncomfortable, you need to find the cause of the fever to treat the cause, such as the fever caused by the occurrence of a cold, often taking cold drugs is more effective, such as aminophenol pseudo-lax dispersible tablets or aminophenol xanthamine granules, both adults and children, basically can be used. If the fever is caused by diarrhea, it is recommended to clarify the cause of diarrhea and treat the cause, and if combined with bacterial infection, antibiotics should also be used for anti-inflammatory treatment.