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Ok I copied n pasted; may be a wall o words though:

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SOURCE: CDC/NCHS, National Vital Statistics System, Mortality Files. Rates calculated via CDC WONDER.
This graph shows the trends in sudden unexpected infant death (SUID) rates in the United States from 1990 through 2020.
The SUID rate, which includes sudden infant death syndrome (SIDS), unknown cause, and accidental suffocation and strangulation in bed (ASSB), declined considerably beginning in 1990. This decline followed the release of
The American Academy of Pediatrics safe sleep recommendations in 1992.
The initiation of the Back to Sleep (now known as Safe to Sleep®) campaign in 1994.
The release of the Sudden Unexplained Infant Death Investigation Reporting Form in 1996.
Since 1999, declines have slowed. In 2020, the SUID rate was 92.9 deaths per 100,000 live births.
In recent years, SUID is being classified less often as SIDS, and more often as ASSB or unknown cause.
SIDS rates declined considerably from 130.3 deaths per 100,000 live births in 1990 to 38.4 deaths per 100,000 live births in 2020.
Unknown cause infant mortality rates remained unchanged from 1990 until 1998, when rates began to increase. In 2020, the unknown cause mortality rate in infants was 29.4 deaths per 100,000 live births.
ASSB mortality rates remained unchanged until the late 1990s. Rates started to increase beginning in 1997. In 2020, the rate was 25.0 deaths per 100,000 live births.
Codes for cause of death were defined according to the International Classification of Diseases, Ninth Revision (ICD-9) for 1984–1998, and the International Statistical Classification of Diseases and Related Health Problems, Tenth Revision (ICD-10) for 1999–2020. We defined cause of death by using the following underlying cause of death ICD-9 and ICD-10 codes: ASSB (E913.0; W75), SIDS (798.0; R95), and unknown cause, (799.9; R99). The SUID rate was the combination of ASSB, SIDS, and unknown cause deaths.
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