Hello everyone! Girls, my daughter is 9.5 months old and has a problem…

Hello everyone! Girls, my daughter is 9.5 months old and has a problem: when she sits on her back wheel round, it's like that for about two months now. We had a prophylactic massage around that time, she was just starting to sit confidently. Plus I try doing some exercises recommended by the masseuse, but she resists strongly, impossible. I'm going to see a doctor (I think we need an orthopedist). While I'm at it, please share your experience with anyone who also had kids sitting this way, what could be the cause, how serious can it be? Thanks!