At how many months did your baby sit on their own or start crawling?

Laura
My baby girl Ellie is 6 months and 2 weeks. She can sit on her own, but only for a couple seconds. When she eats Gerber she still leans to the side. Also when I give Ellie "tummy time" she doesn't like to stay in that position, and just flops like a fish hehe. Just wondering if any babies at this age have started crawling yet. & already sitting on their own. 🤔🤔