My 4 month old has a rash on his neck and chest. I'm think it was from being sat by some relatives - He didn't have a onsie on and just a terry cloth style sleeper. So i'm assuming he wasn't dried off after bottles and the fabric and wettness caused it. What do i do about it? Lotion, super lotion, baby oil, baby powder, neosporin? It doesn't seem to bother him, but I want it to go away fast!