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SIDS/SUDC is one of the leading causes of infant Mortality. We lose about 4000 babies/children a year.

The topic has been studied by many doctors, scientists and pathologists. They have learned a great deal about it and have begun to see commonalities in the cases studied. Hannah C. Kinney is one of the leading experts and has extensively studied the brains of children and infants who die suddenly. She has been involved with studies that prove there is involvement of the hippocampus and brainstem circuits. One study states, “Approximately two-thirds of SUDC cases with hippocampal pathology have a personal and/or family history of febrile seizures, suggesting that such seizures are a risk factor for sudden death in this circumstance.” There are other factors noted including brainstem neurotransmitter defects, Cardiac abnormalities, and abnormalities in the Serotonin Network.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4894250/
The study referenced above lists the Environmental (Extrinsic) Factors as, “Extrinsic factors associated with increased SIDS risk include prone and side sleep position, soft sleep surface and soft bedding over or under the infant, head or face covered during sleep, excess thermal insulation, bed sharing, and postnatal smoke exposure.” These are concerns that have led to the “Back to Sleep Campaign” which promotes putting babies to sleep on their back versus their tummy. One Environmental factor that is conspicuously missing is “Has the infant been recently vaccinated?”