Thanks for the query
As reading the symptoms it appears that your child is suffering from some kind of viral illness most likely measles
. Most of the viral illnesses have their own course and they subside after few days and what they need are just symptomatic management and observation if there is any complication.
So, I would suggest you to consult a pediatrician
so that he will make a proper diagnosis for further management. Meanwhile you are consulting your doctor for high fever
you can give tepid sponging to the baby and ensure adequate hydration.
Dr. Pradeep Kumar