Sitting Goose

G is getting better at sitting up all the time. In fact, he's starting to dislike being flat on his back. He either struggles to sit up (which he can't do) or rolls over and starts scootching backwards (which he can do, although ineffectively). It's a frustrating time for a kid.

Also: suddenly he feels like a little boy in my arms, instead of an infant. Maybe growing new muscles from all that activity?