About 3,500 US infants die suddenly and unexpectedly each year. The cause of death in many of these cases of sudden unexpected infant death (SUID) often cannot be explained, though many of these cases occur while the infant is sleeping in an unsafe sleeping environment. SUID is the term now used to encompass sudden infant death syndrome (SIDS), accidental suffocation, and other unknown causes of sudden death.

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~2015 Illinois Maternal and Child Health Needs Assessment~