Dr. Ariane Kemkes, an independent researcher from Scottsdale, Arizona, USA, says that lawmakers would have mislabelled these deaths as neglect and even infanticide, as SIDS had not been identified by then.
SIDS is the third most prominent cause of death among infants under a year old, accounting for 30-55 percent of infant deaths during their first year.
Historically, the sudden death of an apparently healthy baby during nighttime sleep would have been rationalized as accidental smothering or overlaying.
Lawmakers attributed smothering deaths to negligent caretakers and characterized infant-adult bed sharing practices as proof of parental incompetence.
Kemkes investigated if 19th century infant deaths attributed to smothering or overlaying shared the same characteristics as known SIDS cases.
For the study, she analysed data from the U.S. Federal Mortality Schedule from the years 1850-1880.
She found that, just like SIDS, smothering and overlaying deaths occurred primarily during the second to fourth month of the baby's life.
Such deaths were more likely in the late winter months and amongst boys, and there were more infant deaths among black babies.
"The study strongly supports the hypothesis that these infant deaths represent empirical evidence of 19th century SIDS mortality," concluded Kemkes.
The findings have been published online in Springer's journal Human Ecology.
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