My daughter had the same problem. It corrected itself after a short amount of time. The doctor told me the same thing, but to be honest I don't think it's hormones, I think it's their skin's way of dealing with the harshness of our environment... it's learning to cope. I put lotion on my little girls face after her baths and it cleared up on it's own. Keep in mind that as good as water is for us, three times a day on a new face might be a bit much. Just give it a few days maybe a week or two let it cure itself on it's own. Hope this eased your anxiety...
Your baby will be fine!!