G.G.
My son didn't crawl until about 10 months. EVERYONE kept commenting to me that "something must be wrong with his legs", etc. And it was hard to see that all of my friends kids that were the same age were crawling from 7 months on up. But we just worked with him to keep him on his belly more (he always hated it). We took a big exercise ball and put him on it on his belly with cool toys in front of him to help him "like" his belly. We also gave him things to crawl after- knock down block towers, toys, etc. He didn't crawl until 10 months, but started walking at 13 months and now he's 21 months and doing fine...running, trying to jump, etc. There is such a wide range of skills with kids I wouldn't worry. I think that it's normal range for a child to take up to 15 months to crawl. If you are really concernd and he doesn't seem to be progressing after a month or so..you could always recommend a physical therapy evaluation. Many times the evaluation is free through the county depending where you live. Good luck and hang in there.