Try not to worry. I know how difficult it is when a tiny baby has something you don't understand wrong. If your doctor says it is OK, then it probably is. If your baby doesn't have a temperature and is feeding OK, then you don't really have anything to worry about. If anything changes, like a feeling hot, vomiting or listless, my advice would be just to go to the A & E of your local hospital. Quite often young trainee doctors there have worked in children's hospitals and are quite knowledgeable. We had a baby that had everything you can imagine wrong and I nearly had a nervous breakdown! It will get better, promise.