That millennia long track record contains very high numbers of infant death, and the only thing pushing those numbers down is our ever-expanding collective knowledge of best practices regarding child-rearing.

Women aren't born with innate genetic knowledge of how to prevent SIDS, it's taken generations of studies to figure out causes and develop working practices to counter it.

I you put a baby in safe environment and you don't touch it, don't play with it he widdle and die. Think about that for a moment. One thing for sure we were able to reproduce for millennia but let science do it for a while and see what happen.

The only thing? What about progress in medicine and hygiene? SIDS is a very minor factor in child mortality.

...for example...