It has been a long time since there was a baby at our house, so I guess I'm
The child slept through most of the performance, while the mother played her tub bass.
When the baby woke up, he seems to be enjoying the music. He never whimpered or wiggled.
I googled baby slings, and found some here and here, but nothing like this lady is wearing. I think it is just wonderful that she can care for her child while she's playing her music. I'm guessing the baby will have a good sense of rhythm when he gets old enough to play.