How does 9 months child have a fever 39 degrees a day to do

First observe the child's mental state, if the child's mental state is not good to seek medical treatment in time, if the mental state is good, the child has no obvious discomfort can let the child drink more water to promote the body metabolism, wipe the baby's groin, armpit and other parts with warm water to cool down, if the child because of high fever discomfort can give the child ibuprofen to reduce fever.