Hi A.,
Well, first of all, rashes truly are mysterious. Bottom line....if that is the only symptom, ignore it. Feel free to lotion up and all that, but if it doesn't seem to be bothering him, he's not running a fever, having a drop in appetite, looking lethargic, not eating or drinking, then don't stress about it. Rashes on babies overwhelmingly are essentially nothing. Just their sensitive skin's reaction to one of the gazillion things they come in contact with. Eventually it will go away, but if it doesn't within a few months, or if any of those other symptoms I mentioned show up, get in to see your ped. Most likely you never will find out what it is. I know, frustrating isn't it! And by the way, I was the same age when I had my first baby. Don't you think being a little older makes you appreciate every little milestone more than if you were younger? I've always been glad I started a little later. I think we just appreciate everything so much more. And by the way, there was an earlier posting about somebody's ped deciding her baby's rash was viral and getting antibiotics. Please don't go that route if the decision is viral. Antibiotics are for bacteria. Unnecessary antibiotics cause us to build up a high tolerance for antibiotics, and then they don't work when they need to. Anyway, good luck and God bless.