Thanks for choosing health care magic for posting your query.
I have gone through your question in detail and I can understand what you are going through.
It could most probably be a viral infection. So need to worry at this stage. However if the fever persists then you need to run some investigations such as complete blood count
test. Until then do give him paracetamol
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
In future if you wish to contact me directly, you can use the below mentioned link:
Wish you good health,
Dr. Srikanth Reddy M.D.