My baby suddenly have rash on his face. What can I do to heal him heal? I apply baby lotion with Shea butter, don't know if it helps. Is it due to heaty weather? Unclean bedsheets? I change bedsheets once a week. He is 5 months and fully on formula milk.

there could be a couple of reasons, milk, heat, food, dust mites. have you taken him to the doctor? Is it itchy and does he seem to be scratching alot?

Does he seem to be irritated by it? There is many factors! Try cleaning with cool boiled water to see if it subsides