step two

I don't remember learning how to crawl, so I am not clear how to help David along.

I posted quite awhile ago that he went from a sitting to a crawling (to a hitting the floor with his face) position and he has kept that up. However, if he doesn't fall on his face, he just lays on his tummy.

Today, he was on his tummy on our bed when pushed himself up onto his hands and knees and rocked back-and-forth several times. Then, when I put him down for a nap, he hit the mattress with his hands and knees and remained that way for a moment. I have previously not been able to get him to do that.

So next is learning to do that contrapostal thing with his shoulders and hips while lifting alternate knees and arms. How does someone who has never used his arms and legs for locomotion, and who has never seen someone crawl, figure that out?