Wanting to Crawl

Tyler is becoming more and more mobile but still has not figured out how to crawl. He loves sitting up on his own and is able to reach pretty far to get to toys. We often let him sit on the floor with a pillow surrounding him for cushioning. While Tyler does not topple over as much as he used to, he uses the pillow to help him get closer to the floor. He will lean back or to the side on the pillow and then flip over to his tummy. From that position he attempts to crawl. Sometimes he actually moves backwards because he knows he needs to use his legs for crawling but still has not figured out how to incorporate his arms. After he realizes he cannot actually crawl Tyler just rolls to one side or the other to get to where he wants to go.