Fevers are a sign of an infection or inflammation.  It is helpful to drink cucumber or celery juice as these are ultra hydrating and can help bring a fever down.  You can add apple juice in the mix if your little one is not fond of the flavor of celery or cucumber alone.  Peppermint essential oil on the soles of the feet can bring relief as can a tepid bath.  Also, homeopathic remedies like Aconite or Belladonna can be useful.  Consult your health practitioner for dosing information, and always see a medical provider if you are concerned there is a bacterial infection or symptoms worsen or persist.