Even the high number is "only" 1.1 in 1000, so 0.11%. Still, 0.013% is quite a bit lower. My kids haven't had any trouble sleeping on their backs (yet - the you

Even the high number is "only" 1.1 in 1000, so 0.11%. Still, 0.013% is quite a bit lower. My kids haven't had any trouble sleeping on their backs (yet - the young one is only four months), but if they had I think I'd let them sleep face down and just watch them better. There are devices that detect breathing in a baby bed and warn if none is detected for X seconds, which might ease the minds of worried parents - regardless if face up/down.