There's a fair bit of evidence that a good chunk of SIDS deaths are from infants sleeping in the same bed as the mother, particularly for mothers who're obese/drugs/etc.
It's strikingly uncommon for healthy weight mothers who dont cosleep, likely because it's "Hey hubby, can you keep an eye on our baby while I nap" instead of a single mom faceplanting into bed in a donut, booze, and work-exhauation induced haze followed by rolling over and suffocating the poor baby.
There's really no increase in SIDS risk for infants who bedshare with mom under the right circumstances. Exclusively breast fed- no bottle- normal weight mom and baby, no substances used, firm mattress, common sense. Most bed sharing deaths are infants bed sharing with siblings or on a chair or couch instead of a bed or with a mother under the influence
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