Hi - my baby (now 16 months old) has rolled less than 5 times in her life. We did tummy time, she started crawling at 8 mths, cruising at 10 mnths and walking last week (16 mths).

I don't think the lack of rolling has made any difference. In fact, it was better she is a 'late' walker as she is very strong and steady and bearly falls over, unlike some 'early' walkers. I think provided your baby is not getting frustrated by 'lack of rolling/crawling' etc, there's no problem.