This crawling thing is new to us. Noah learned to crawl when he was 10 months old. Once he figured how to move on his knees, he started rolling around on his butt. Then one day, he just stood up and started walking. Okay, it wasn't exactly like that. But pretty close. So, having Harrison bolting around our house on all fours is a new experience. I guess what they say is true, every child is different.