N.M.
Yes it is normal my daughters and my sons did the same thing.When I spoke to thier doctor they told me that its just the childs way of exploring thier bodies and that it feels good to them not that any parent wants to hear that. If it is causing redness i suggest getting her diapers in a bigger size so that there is more cusion for her. She will eventually out grow it. It is just somethign that you have to deal with right now I know that she is only going to be two but try and tell her that she can't do it in public or around people tell it is ok and do do it in her room she will evenutally stop in public and alltogether if it is still a problem talk to her doctor and she what he/she says to do maybe there is another way for her to do it without causing the redness.
from N. a mom whos been there!