I never crawled, I just went straight to walking at 11 months. But then my daughter will show no signs of wanting to do something and then she will do it the next day! X
Some skip crawling & go straight to walking so it's nothing to worry about. Max is 7months & can't roll doesn't show any signs of wanting to roll. But he's been sitting a while & can stand holding on for a few moments. He wants to be on his legs. They all get moving eventually in their own way! Lol