She just did it three times in a row, so I’m officially declaring that Ruby can turn over from her back to her stomach by herself. She does this by lifting her legs in the air, flopping over to her side, and then rolling from there.
This is nominally good news, but unfortunately Ruby isn’t happy being on her stomach once she gets there. This means I have to rescue her from her floundering much more frequently. Eventually, though, she’ll learn to be comfortable on her stomach — especially now that she’ll be spending even more time on it.