Sleeping Position

Evan has been sleeping all over his crib. He's rolling around and sleeping on his tummy. I never thought he would sleep on his tummy since he never liked tummy time but I guess he gotten used to it. I have noticed him recently sleeping on his knees. He's not quite crawling yet but he gets on his hands and knees in the crib and rocks back and forth. I was sitting here at the computer and I heard him making noise so I looked to see what he was doing (with the video monitor) and he was sleeping with his hiney in the air!! I got a picture of it from the monitor screen so it's really not clear but you can kind of see him sleeping.