Scientists find Abnormalities in the Serotonin System of the Brain in infants who died of SIDS. This is the third study to find problems with this system, giving confirmation that it is, indeed, a major issue in SIDS. Children with SIDS were found to have higher serotonin receptors but a dearth of transport cells compared to other babies who had died of other causes. The focus of the study was on the medulla oblongata and cells within it. Basically when presented with less breathable air (such as when a baby is on it's stomach and re-breathing the carbon dioxide it has exhaled), the area of the brain that would normally signal the baby to wake up and move his head doesn't work.
This is all the more reason to go with recommendations to put babies down to sleep on their backs, without pillow or other obstructions, on a firm mattress.
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