My little man has just turned 9 months and he won't even attempt to try and crawl.
when i put him on his tummy he screams until i either lift him or he rolls himself over, my daughter who is now 13 started crawling at 8 months and my son who is 10 started at 9 months.
Ryan would rather walk and stand than try and crawl so my health visitor thinks he might just walk first.
All children are different and do things at different times, Ryan got his first tooth at 6 months while my other children didn't get any until much later.
I wouldn't worry too much about him crawling tbh x