But here is an alarming new fact: Smoking by mothers has replaced infants sleeping on their stomachs as the greatest modifiable risk factor for sudden infant death syndrome, or SIDS.SIDS is the sudden and unexplained death of an apparently healthy infant aged one month to one year.
A recent study found that when mothers smoke, the sleep arousal process of infants, which awakens them in response to a life-threatening situation, is altered, increasing the risk for SIDS.
Infants who have been exposed to smoke have reduced sub-cortical activation to cortical arousal. They also have lower rates of full cortical arousal from sleep and higher rates of sub-cortical activations than infants of nonsmoking mothers. Decreased cortical arousals from sleep have been observed in infants who later died of SIDS.
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