M.W.
I would give my baby some baby Tylenol then give him a warm (not hot) it should feel almost too cool. It should work. don't dress him warm. a t-shirt will do. If you dress him to warm it wont take his fever down or if the bath is to warm it wont take it down either. let me know if it works for you, did for me and my nephews several times.
M. Redding Ca