A 6 year old child with a fever of 38 degrees is most likely to have an upper respiratory tract infection caused by a viral or bacterial invasion. You can drink more water, pay attention to rest, take vitamin C supplements, open the windows to make the air convection, to prevent cross-infection. You can take pediatric cold and flu granules orally, which can treat and relieve various symptoms caused by cold and flu, such as fever, headache, nasal congestion, muscle aches, sore throat and so on. You can also take oral Chinese medicine, such as Pu Di Lan Anti-inflammatory Oral Liquid, Blue Scutellaria Oral Liquid, Lian Hua Qing Fever Granules, etc. to clear the heat and detoxify the toxin. If the child’s body temperature exceeds 38.5 degrees, he can take ibuprofen suspension drops or acetaminophen suspension to reduce fever, which can quickly reduce fever. Fevers caused by wind-cold colds can be treated with Jing Fang Wei Po San, which has a pungent and warming effect on the surface. For fever caused by wind-cold, it can be treated with Yin Qiao San plus or minus, which has the effect of cooling the exterior of the body.