I mean, infants are typically warmer than adults and they wriggle around a lot - it's hard enough to sleep next to them, much less within suffocation distance.
This part of the reply to my SO's question about this. Later he explained that it's mainly drunk/high people who suffocate their children like that.
You only need a sufficiently wide bed and separate covers for the parents - that's it.
That's a lot of people!
> You only need a sufficiently wide bed and separate covers for the parents
Why even take the risk.
https://news.ycombinator.com/item?id=37796452
> they got into a weird position between a very very drowsy mum and some cushions and we didn't notice.
> parent is not sober and essentially knocked out unconscious.
Parent of newborn sleep deprivation is extreme.