A Babe and her Belly...button...

Some little ones have blankies, other use soothers, some like their thumbs or find stuffies soothing. But our babe...she likes her thumb and her belly button. 
We don't know how it started or why but when Addison needs a little comforting she sucks ner thumb and sticks her finger in her belly button.

The belly button is such a necessity that if she can't access it, there is some serious tears and drama! "My belly!! I need my belly".  Regular shirts allow the easiest access. Skirts and dresses are simply hiked up.  However, winter coats and carseat straps pose a serious problem.
When we asked the doctor if this is normal, he response was, "I've seen this before, I think...". Not very reassuring.
All I can say is that I hope she grows out of it at some point...