She's been toying with the idea of becoming mobile for quite some time, but has really blossomed as of late. I never find her in the same place that I put her down. She can roll over in under 3 minutes, get her hands free, and just tonight she flipped over from her stomach to her back (more than once).
The 3 minute roll-over
I was pretty proud of that accomplishment on her part. We were at a friend's baby shower and I put Rachel on the ground. She flipped right onto her stomach and then a few minutes later was on her back again. I was so excited...I don't know why since this means we'll have to make our house baby proof. Personally, I think she was just showing off for all the little boy babies there. Rachel and Amy were outnumbered by their male counterparts 2 to 1.
Rachel can pivot around on her blanket, too, and gets stuck under her little gym all the time. She shows very little interest in the toys hanging down over her head but loves to kick at the legs for some reason, so she'll twist around so that she can kick them.