Sudden unexpected infant death accounts for more than one-third of the infant mortality disparity between Black and white infants in the US.
RT’s Three Key Takeaways:
- Widening Racial Gap: Sudden unexpected infant death accounts for more than one-third of the infant mortality disparity between Black and white infants in the US.
- Beyond Preterm Birth: While differences in gestational age at delivery historically drove the disparity, sudden unexpected infant deaths have emerged since 2020 as the leading single cause of the expanding gap.
- Respiratory and Environmental Triggers: Researchers suggested that the recent rise in sudden infant deaths coincided with pandemic disruptions and off-season resurgences of viral respiratory infections, including RSV, influenza, and COVID-19.
After decades of steady decline, rates of sudden unexpected infant death (SUID) are rising again in the United States, disproportionately affecting infants born to Black mothers, according to a study published in JAMA Network Open. The findings help explain a widening gap in infant mortality between Black and white populations since 2020, researchers reported.
“This study provides evidence that there is an acute crisis right now in sudden unexplained infant death, a category of cause of death that we assumed we got under control a long time ago,” said Leslie Root, demographer and assistant research professor in the Institute of Behavioral Science at the University of Colorado Boulder.
According to the authors, infants born to Black mothers face mortality rates roughly twice as high as those born to white mothers, an inequality that has persisted for decades. While higher rates of preterm birth historically accounted for the difference, public healthcare initiatives focused on prenatal education had helped make progress until the gap began widening again in 2020, the study authors stated.
Analyzing Decades of Infant Mortality Data
To investigate the shift, the researchers examined federal records covering nearly 58 million live births between Jan. 1, 2003, and Dec. 31, 2024. The analysis evaluated linked birth-and-death certificates for 366,384 infant deaths among non-Hispanic Black mothers and 224,733 among non-Hispanic white mothers.
The investigators categorized gestational age into seven brackets, spanning from extremely preterm at 28 weeks to post-term at 42 weeks, and classified causes of death into 13 distinct groups, according to the study.
Although differences in gestational age remain responsible for much of the mortality gap, the authors determined that SUID—which encompasses sudden infant death syndrome, accidental suffocation in bed, and other unexplained deaths—now represents more than one-third of the disparity, making it the largest single cause-of-death contributor.
“This finding suggests that even if preterm birth disparities were eliminated entirely, a large mortality gap would remain, and sudden unexpected infant death is what is driving the increase,” said Root.
Respiratory Pathogens and Social Vulnerabilities
The research team emphasized that while SUID rates remained relatively flat among infants born to white mothers, rates among Black infants increased alongside the onset of the COVID-19 pandemic.
According to the news release, recent studies have indicated that off-season resurgences of viral respiratory infections, such as COVID-19, RSV, and influenza, may leave infants more vulnerable to SUID. The investigators also noted that sustained economic and social challenges stemming from the pandemic, as well as an increase in opioid overdoses that surpassed rates among white Americans for the first time, may have intensified existing healthcare disparities.
An estimated 3,400 infants die unexpectedly in the US every year, according to federal data cited by the authors. In future investigations, the research group plans to evaluate whether parental opioid exposure contributes to SUID risks, while expanding studies to evaluate Native American and Alaska Native populations.
The study authors stressed the need to revitalize public healthcare awareness campaigns.
“We have come a long way since a few decades ago,” said Root, referencing successful safe-sleep guidance and crib standards. “That’s why this uptick, and the fact that there is a racial disparity component, is so alarming. We need to address it.”
