Nearly 3,500 U.S. babies died suddenly and unexpectedly in 2013, roughly the same number as in 2012. Recent state and federal efforts are paving the way to better understand and collect more comprehensive data on sudden unexpected infant death (SUID).

The Centers for Disease Control and Prevention (CDC) and the National Center for the Review and Prevention of Child Deaths developed the SUID Case Registry in 2009 to collect data on cases to improve investigations and monitor trends. Since then, SUIDs have decreased slightly overall while sudden infant death syndrome (SIDS) has decreased steadily each year.

The registry is a population-based, multistate surveillance system that tracks sudden unexpected deaths in infants up to age 1 in nine states. SUID Case Registry grantees work with child death review committees to share data sources and discuss the circumstances for all SUID cases.

In June 2014, the CDC and the National Institutes of...

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