Good day! Daughter is 12 February will be 8 months old, but we haven'…

Good day! Daughter is 12 February will be 8 months old, but we haven't even turned her over yet, that is, I will put her on the floor, she lies down herself and doesn't think about turning over or spinning. As soon as I put it down, it lies down. In general, everything is fine with us. We ourselves already sit from the position lying down, but sits not firmly immediately falls on its side, does not abuse this, does not sit down myself. When I hold her by the handles, she pulls up, says syllables ma, pa, ba and so on. But something bothers me that she doesn't want to turn over at all, I am