Wa'alaikumassalam sis! Don't worry la, setiap baby develop at their own pace, some crawl early, some late, semua normal je. A few of my mum friends pun sama, their babies baru start moving around closer to 10-11 bulan, then tiba-tiba semua benda boleh lah. Tapi since you're first time mommy and it's on your mind, best to mention it to your paediatrician at the next check-up, dia boleh assess properly and set your mind at ease! In the meantime, banyakkan tummy time dan encourage dia dengan toys, siapa tau maybe next week dia dah started crawling