This Bean has all kinds of rolls

Well, I was watching Esme while Zoe went to get a massage... I thought it would be fun to do airplane/supergirl with her.  She promptly decided to puke in my mouth (I guess all I can say is that it wasn't as bad as I thought it would be). So, while I'm cleaning up, I put her on her back on the blanket.  I turn back around and she's on her stomach! I go through my head wondering if I missed something... here's the evidence:

Esme has  been working at this for weeks now.  She's been able to roll from front to back for over a month now.  What's been getting in her way has been her shoulder.  Yesterday, she was almost all the way over, but just got frustrated and went back. This a big step developmentally... she's on track to be a super hero!