Babies should be encouraged to crawl before they walk. Play loads of games on the floor and do excises to encourage crawling. If he walks before he crawls, play crawling games like hide and seek on the floor or crawl over him as he starts to crawl so he must speed up. Check out a few articles on our website that have examples of games to play. http://www.babysense.com/happy-days/babys-devlopment/concerns-over-late-crawler