Every morning I put Brooke on her tummy 1st thing. I watch as she repeatedly almost rolls over and then stops herself at the last second (she also does the same when on her back, turning 99% of the way to her tummy and then stopping). Honestly, I think this signals that she has skill ... a lot of babies cannot stop themselves from tumbling over, and she doesnt seem to have any issue with controlling her movements.
This morning she finally did it! She rolled from her tummy to her back! Twice! Yay Brooke!