angline,
initially when i first put up abc mats, my girl just sit on the corner, dun want (or dun know?) to crawl. then i show her to crawl by crawling around her n encourage her to follow (by moving her hands and legs). 2 days later she crawls already, but on the abc mats only. then i show her that i can crawl beyond the mats, and now she's unstoppable, crawl everywhere. maybe u can try that too.