Joy wrote:
   <<At 1, 3, and 6 months of age the mothers were asked about fever, cough,
wheezing, stuffy nose, breathing trouble, sleeping problems and vomiting.
No infants choked on their own vomit or spit-up and the babies put down on
their backs were less likely than stomach sleepers to develop fever or a
stuffy nose, or to visit the doctor.>>

<<... I reckon there are some counfounding factors in here. >>

Here's one--my co-sleeping breastfed babies always rolled onto their backs
after coming off the breast. Did they factor in which of those babies were
breastfed, or co-sleepers?

Edie

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