D.S.
Hi, M.:
1) Don't use baking soda in the bath.
It is so drying to the skin.
2) Get a spray bottle and fill it with water and
see if you can spray her bottom and front to
get the debris off and then pat the area lightly
to dry.
Irritation can come from the urine in the diaper.
3) Give her water to drink often.
Good luck.
D.