We went with an Owlet sock that we got pre-nerfing from the FDA to track breathing/O2. The internet connected monitor was actually the Owlet cam. It worked decently enough, but just headaches from it being a cloud connected camera pushed us to get an RF-based system when we wanted a second camera.

If it works for you, that's great. I'm not trying to yuck your yum, just sharing my own personal experiences.