What is this rash? I started him on oatmeal a few weeks ago and he’s been doing good. Then I started carrots and then all of a sudden every diaper he kept pooping and got the worst diaper rash ever. I thought it was from the carrots, but he had a stomach bug. Then I waited to feed him oatmeal almost 2 weeks after that whole stomach bug went away. Last night, I just started sweet potatoes with him and early this morning , I found this rash all over his stomach, on chin and neck. I put aquaphor on it, but it doesn’t seem to bother him. He didn’t have it when he went to bed either. Could this be from the sweet potatoes or something else? I haven’t changed anything with his laundry detergent or nothing. Everything has been the same. Should I contact doctor if rash doesn’t go away?