Children’s body temperature of 37.9 ℃ is a low fever, you need to give the child a comprehensive examination to check whether there is respiratory tract infection, such as whether the throat is congested, edema, whether there is accompanied by coughing, nasal congestion, runny nose, headache and other symptoms. The normal body temperature of children is between 36-37.2 ℃, if between 37.3-38 ℃ belongs to the low fever state, some children will be manifested as headache, body chills, mental state is not good, this time, you can give the child to take pediatric Chai Gui antipyretic granules, is conducive to lowering the body temperature. If there are bacterial, viral or mycoplasma infections can take antibiotics or antiviral drugs, such as cefixime granules, azithromycin granules or blue scutellaria oral solution for treatment, and at the same time to drink plenty of lukewarm water, a light diet, eat more fruits rich in vitamin C, is conducive to the recovery of the disease.