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Infant Suffocation Deaths Are Rising

But Study Shows Sudden Infant Death Syndrome Is Declining
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WebMD Health News
Reviewed by Louise Chang, MD

Jan. 26, 2009 -- Rates of infant mortality due to accidental suffocation and strangulation in bed have quadrupled since 1984, a new study shows.

In the same period, rates of sudden infant death syndrome (SIDS) declined, while sudden unexpected infant deaths remained stagnant, shows the study, published in the February edition of Pediatrics.

The seeming contradictions in increases and declines in deaths of infants are likely due to changes in the way such tragedies are investigated and classified, researcher Carrie K. Shapiro-Mendoza, PhD, of the CDC, tells WebMD.

She credits an "impressive" decline in SIDS cases to a national "back to sleep" campaign that, among other things, urges parents to put babies to sleep on their backs.

The reason for the sharp increase in accidental suffocation and strangulation in bed, or ASSB, isn't known for sure.

"It's probably due to poor bedding, blankets in cribs, sleeping with parents or siblings, or bad habits," she tells WebMD. "Or infants getting wedged between the mattress and the wall."

Also, despite urgings from the American Academy of Pediatrics and the CDC, many parents still put babies to bed on their stomachs, which can lead to suffocation.

The decline in SIDS rates has been offset by an increase in other sudden unexplained infant deaths, a new category called SUIDs. ASSB death, a subgroup of SUIDs, is a leading cause of infant mortality, says Shapiro-Mendoza.

SUIDs include all deaths attributed to accidental suffocation and strangulation, SIDS, and unknown causes.

Shapiro-Mendoza tells WebMD that infant deaths attributed to ASSB increased from 2.8 to 12.5 deaths per 100,000 live births between 1984 and 2004. She says such deaths increased dramatically between 1996 and 2004 (14% average yearly increase), a period in which mortality attributed to SIDS declined.

Black males under 4 months were disproportionately affected by accidental suffocation and strangulation, Shapiro-Mendoza says.

Preventing Infant Deaths

Shapiro-Mendoza tells WebMD that ASSB deaths are potentially preventable. She says a "comprehensive" investigation of the site of death is critical in determining cause of death. Often, she says, autopsy findings can't tell the difference between strangulation or physiological causes such as heart defects.

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