Hi, Thanks for the query. From the description provided by you, I feel that your son might be suffering with viral fever as you don t describe any urinary symptoms. Usually the viral fever resolves on its own by 4 - 7 days. If the temperature is too high and is not being controlled by oral anti pyretics and cold sponge, you can use a Paracetamol suppository. He might require hospitalisation if he doesn t eat and is being dehydrated. Hope I have answered your query. If any further questions, will be happy to help you.