Rolling Over

Parker has not rolled over yet, he has gotten close a few times. I don't know if I should be worried or not. He likes to "scootch". He places his arms spread eagle, arches his back and pushes off with his legs, he can move pretty good that way. He likes to get into his clothes in his changing table that way. When I ask him what he is doing, he grins up at me and keeps pulling the clothes out.