Getting better at rolling over

Nikki adds:
The first picture above is from this afternoon when she was watching the cats for a long time today (Aslan was playing with a string not too far in front of her).

The other pictures are from doing tummy time, rolling over time (besides her rolling by herself, Aaron helps her roll around quickly on the bed ... hard to describe), and play time with papa, like she does every night. She used to get kind of frustrated when she rolled over, couldn't figure out what to do with the arm underneath her. Now she just pops right over to her belly from her stomach, arms moving baby-swiftly, and pushes up so she can see all around. Oh, and she's started to push up a little so her hips are in the air to get into crawling position. And she tries to push with her feet but hasn't quite figured that out yet.

She's getting better at sitting by herself, too. She was sitting up pretty tall with her arms supporting her but then fell over (gently) when I went to take a picture....