Crib death rates in various countries fell during the 1990s but have now levelled out and are no longer falling. Why is this?
In most countries these reductions in crib death rates were the result of face-up sleeping campaigns. However, for reasons relating to the chemistry of the gases which cause crib death, face-up sleeping is only a partial preventive. In particular, it is not very effective against the danger posed by phosphine. As a result, all face-up sleeping campaigns (wherever they occur) achieve a reduction of around 45-50% in the crib death rate, at which point the rate hits a plateau and does not fall further. This plateau has now been reached in the US and Canada.
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