I understand what you're saying, Helene. Yes, sometimes it can appear as though body parts are "floating" in a sense if you can't see that they are attached to someone's body. Here though, I think the viewer would feel as though they are holding the baby themselves, as if these hands were their own.
The arm doesn't bother me. I wondered what it was, and thought it might be a leg or something. It's out of focus enough that it isn't distracting in my opinion.