Cornstarch mixed with water. Makes a paste.

Baby powder

In the meantime you can put some aquaphor, but make sure the area is clean and dry first

@hallek129 thank you I called her pediatrician appointment is scheduled

Cornstarch works good for some people, it work good for me for a little while but if she has a yeast infection it could actually feed it. So, it's better to have the pediatrician see it and make sure it's not yeast.