My daughter is almost 10 months old. She can sit and play unsupported, she can stand on her own (with me hovering over her for support) and she can crawl. For some reason she doesn't go from her belly to a sitting up position. She goes with ease from sitting to crawling but I don't know if she can't sit up on her own because she expresses no interest in sitting back up because she loves being on her belly. Does anyone else have a baby about 10 months that does not go from belly to sitting up position yet?