I forgot to mention –
Just before David turned 8 months old, this happened:

Sitting up on his own! Hurray! He’s a pro at it now.

Still no crawling, but lots of rolling and spinning around on his tummy. Our pediatrician noted some low muscle tone in David’s legs at his 9-month check-up, so we’re doing lots of standing practice to help those legs get stronger. Sometimes this involves lots of time in the exersaucer, and sometimes it means a dance party while being supported by Mommy or Daddy!

I’m definitely grateful for both of my healthy boys. They are learning to play and laugh together, which is one of the most amazing things to experience. We have a lot of silly in our house these days.