I left him asleep and came back and he was awake, just sitting here. Never would have happened with Zack. Neither the sleeping in the seat, or the waking up and not telling me about it.
We took Grandma Madelyn to the Met while Zack and his Dad spent a few hours at an awesome playground nearby. Then we walked across Central Park, crossing this bridge on the way:
Ash is 3 weeks old today. When I put him on his tummy, first he promptly rolled right back into his back, and then he scrabbled with his hands and kicked with his feet and propelled himself more than a foot forward. He's pretty mobile!