Yesterday morning, when Mark when to get Steven from his crib, he found him sitting up. That's the first time he's gotten himself into the sitting position. He was sitting up again when we went in after his nap and again this morning.
The crib was still on the top mattress setting, so yesterday Mark lowered it to the lowest setting. The bumper for the front crib rail is in the wash, which explains why his legs made it through the slats again. I think he's pretty proud of himself!