Just went in to check on him because he's playing around in his crib when he should be napping and he apparently has taught himself to sit up on his own because there he was, sitting up in the middle of his crib. I ran to get the camera but he had already gone back to his stomach again. He actually did it a few more times but I wasn't able to get a picture.
I asked him a few days ago if he would learn how to crawl instead of creep for my birthday but I'll take sitting up by himself and his first tooth cutting through instead!
My little boy is growing up!