dad here. i firmly believe all of the opinions about it are true. sids is real, positional asphyxiation is real, and some parents, probably often postpartum depressed mothers do kill their newborns and it gets masked by sids and society is turning a blind eye towards it. my own child had a few nights where he was sleeping extremely deeply and breathing seemed to stop for many, many seconds. i counted to ten then woke him up. thrice in one night. no sleep for me. immediately i got a breathing monitor for him that beeps if no breathing is detected in 10s or more. it beeped twice the following night, waking up everyone but him. he was very deeply sleeping, not breathing for over ten seconds, not waking up even though the intense beeps of the monitor, but luckily, i managed to wake him up within 2 seconds after that. picking him up, shouting, moving his legs and body. he wasn't blue, woke up crying like hell, but there was no lasting damage other than in my psyche, because it took me several weeks to be able to sleep normally again. the monitor never beeped after that and beyond the first birthday, these cases are ultra extremely rare. but we almost have had this happen. it was the week after he had covid in his 6th month, so it was most definitely related to the illness.  positional asphyxiation is also real. i had him slump forward in the car seat while he was 7 months or so. no noise, no sound. he slept, slumped forward and if we didn't have the special mirror to see him in the reverse baby seat, i wouldn't have known. being paranoid as i am because of the earlier episode, i was looking in the mirror far too often (probably not paying enough attention on the road, but anyway) and saw it immediately, pulled over within a second and woke him.  it is real. babies' breathing is finicky. be prepared. buy the monitor, and a car seat mirror so you can see what's happening.
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