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A new study out of Boston Children’s Hospital suggests a cause for Sudden Infant Death Syndrome.

Researchers studied the autopsy results of 15 babies who died from SIDS in safe environments, meaning there was no chance they were suffocated by bedding or cigarette smoke.

They also studied 35 babies who died from SIDS in unsafe environments.

All those children were compared to infants who died from other conditions.

Experts found chemical abnormalities in the brain stems of the SIDS babies, regardless of their sleep environment, suggesting they had this abnormality before they died.