Until the early 1990s, the most common sleeping position for infants—in the US and elsewhere—was on their stomach. The reason for this is likely that many infants sleep better this way—they don’t wake up as much.1 However, as early as the 1970s, there were some clues that stomach sleeping was associated with a higher risk of SIDS.2 Studies comparing populations with different sleeping patterns showed worse outcomes for the group that slept on their stomach. These
