Roll over, roll over

Over the past month Alexander has accidentally rolled from tummy to back. He hasn't been as shocked by the roll like Eliza was, but it clearly wasn't doing it on purpose. Today (3/9/16) I put Alexander down for tummy time but after a short time he pushed himself over to roll. I put him back on his stomach and he rolled again. He then did it 6 more times, clever boy. Here are a few videos of him rolling over. 

The only downside of him being so clever to roll is that he now doesn't do tummy time for