Oh my! I know what you are going through my daughter got a terrible diaper rash with every tooth she cut. I had never heard of it. But it seems that my husbands side of the family it happened to there kids too. My daughters ped. said it was possible. So he gave me steroid cream too. But he also told me i could mix aquaphor lotion and malox together. It is wonderful soothed her asap! The malox takes the acid away. I always have it on hand. I use it all the time for her butt rash.
hope it helps!