“Federal study finds 55 percent of infants sleep with soft bedding, raising risk of death “, Dec. 1, 2014, p. A21 , reporting on a recent article in Pediatrics. The study used data from the 1993-2010 National Infants Sleep Position Study, which interviewed about 19,000 parents by telephone and examined changes in sleep practices year by year. The study reported that the use of soft bedding, blankets, and pillows, decreased by 23% between 1993 and 2000, but has not decreased much further, with 55% of infants in the United States still experiencing this known SIDS risk factor.
N.B. I now see that on Facebook Ed Clint of Healthy Skeptic has said that my statements about SIDS and sleeping position are comparable to someone without good evidence saying that all the statements of climate scientists are wrong. No, actually, what it's like is a student of the climate saying that more factors than human activity are responsible for global warming, and in order to understand the impact of human actions we must take into account what the other factors are and how they operate.
5/20/15: For anyone who thinks I am way out of line to look at diagnostic categories as an issue here, you might have a look at https://eliminatechildabusefatalities_sites.usa.gov/files/2014/05/Transcript-Tampa-FINAL.pdf, pp 11-12.