Maybe it's more difficult to roll onto their faces with a pacifier, or they could be lighter sleepers if they're using pacifiers.

We're no longer recommending the side position because infants often roll over onto their stomachs.

This is despite a 53% decrease in the U.S. SIDS rate since the American Academy of Pediatrics recommended in 1992 that babies be placed to sleep on their backs, ... This reduced rate reflects nearly 3,000 fewer infant deaths per year, or over 15,000 fewer deaths since the original back-to-sleep recommendation.

This is particularly concerning, because studies have shown that babies who are used to sleeping on their backs are placed at a much higher risk for SIDS when they are subsequently placed on their stomachs.

More babies still die of sudden infant death syndrome than any other cause during infancy beyond the newborn period.

It's just one other bid of evidence from a national health standpoint that tells us we ought to be educating day care centers and grandparents, as well as parents.

If we knew exactly what causes it, we wouldn't call it SIDS.