Declines in US SUID rates have slowed since 1999. SUID rates only decreased 7% from 1999 through 2015, as compared to 45% from 1990 through 1998.

In recent years, SUID are being classified less often as sudden infant death syndrome and more often as accidental suffocation or strangulation in bed.

Although some states have experienced notable declines, wide variations in SUID rates by state still exist.