DD has rolled over exactly ONE time (about 3 weeks ago), and it was totally by accident. Hasn't shown any interest in doing it again. She still cries and thrashes during tummy time. Doesn't scoot, hardly even pushes up with her arms.
I know they all develop differently, and she is sitting up on her own if we plop her down somewhere, but I wish she would even show SOME sign of wanting to move!