It's based on a RIKEN study where they put ECG monitors on babies and mothers to track what happens when you try to put a baby down. Spoiler: the heart rate spike isn't from touching the mattress. It's from losing body contact with you. That one finding changed how the whole protocol works.
Two things I want feedback on: does the content actually make sense, and does it feel trustworthy or does something feel off about it?
PDF is in the comments. No email, no signup. Just read it and tell me what you think — including if it's not useful, that's the whole point of asking.