S.S.
My pediatrician told me that that is a good sign of them starting to get ready for potty training. They're beginning to recognize that pee or poop in their diapers is uncomfortable to sit in and realize that if they take it off to go, it doesn't feel as bad. Fortunatly, my little one never did that, but it's also taking a REALLY long time to potty train because he doesn't care if he sits in a wet diaper. So I would say, be glad she does that, because my pediatrician said it is usually easier to potty train them when they do that.