DS is eight months, he crawls well, although is quicker using hands and feet than when he uses his knees (we have hardwood floors so I thought this might be about grip), he pulls himself up to standing on furniture, people, whatever he can grab onto.He sits without issue in a highchair, even those square wooden ones you get when out and about with no support. He doesn't sit well on the floor. He topples over to the side, or just rolls over and crawls off. Everything I've read implies that sitting and playing is a precursor to crawling, but it's like he skipped a bit. He's very strong can climb over the back of the sofa, up the bedstead, and I've had to drop his cot to the lowest level to stop him trying to climb out. His back and neck seem strong, he's had plenty of tummy time from a young age.
Why can't he sit?! PFB so no frame of reference and DNs both seemed to sit before crawling.