Just after my last post, Maegan rolled over for the first time! She was on her tummy, up on her elbows, and she moved just the right way to roll over to her back. She even did it three times in a row! We haven't been able to reproduce it for Matthew yet, though. We'll be patient, because soon enough, we'll long for the days before she was mobile.
A quick comment about the picture of Maegan and her friends: The babies were all born within about 4 months of each other. Emma is the oldest, and Rowan is the youngest (they are seated in age order).