When did your little begin to crawl?

We have a sweet 7mo boy, we also have a 7 year old girl. Our daughter began crawling at 7mo, and our son isn’t showing the signs I am used to watching for. He has a ton of tummy time, scoots himself in a circle on his belly, but does not go up on all fours at all. He’s been sitting on his own since 6mo but now I’m like, what’s the normal timeframe for kiddos to crawl? Is he still on track? I know I’m not supposed to compare but it’s tough sometimes!

When did your little crawl? And, were there differences in timing between your kiddos? I know every kiddo is different - so I’m trying to keep that in mind 🤍