It’s a pocket of CO2 (probably.)
That’s why removing blankets and crib bumpers and sleeping in their back helps, all that increases airflow.
Babies have weaker, small lungs, and the theory is also the system we all have that half wakes us to move around as we sleep isn’t as fully developed.
So they are on their belly, face in blankets, a pocket of co2 around them, that doesn’t move due to small breaths and confined space.
Then rather than rolling over like a kid or adult does, their brain doesn’t trigger that movement to shift to fresh air.
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