Thanks for opting healthcaremagic.com to post your queries and to give us this opportunity to clarify your doubts.
Well,from what history you give us , it sounds like your baby has some kind of a viral fever- fever, cough cold
with a rash
which started on the trunk. How is the baby otherwise- i mean the general condition of the baby-is he feeding as usual, is he happy or very irritable, is his urine output normal, does he cry while passing urine, vomiting
, loose stools? He will need to have some anti-histaminics for his cold and cough and also for the rash. I would recommend you to see your pediatrician
in case the rash and fever persist. The doctor can also see the rash and that will help him in the diagnosis. Continue to give your baby regular diet and plenty of fluids, that will help thin out the secretions and ease his cold.
I hope I have been successful in clarifying all your doubts. I will be always available in case of further doubts. Take care and stay healthy.