Ok, just since posting yesterday about Adin going on all fours, he has become more comfortable in that position and will move into and out of it more easily.
Adin had a flu shot today. It went fine. On the way out, my bold husband weighed and measured our boys. Adin was about 17 1/2 pounds (clothed but hungry). Erik was 37 pounds, fully dressed, and 37 inches (in boots).