A fever is your body's natural reaction to an infection it is trying to fight. Apply peppermint to the forehead, back of neck, and bottom of the feet every 15-30 minutes until fever goes down. 

This can aslo be accomplished by placing a couple drops of peppermint or lemon in a cup of water. You can also diffuse these oils or even prepare a foot bath with 1-2 drops of Peppermint and/or Eucalyptus. 

Always remember to dilute with a carrier oil when using with children.