SIDS can happen to any Baby, from my understanding, even babies with attentive parents.
What still looks bad here, is they went to sleep with a puppy roaming loose, and they were both so deeply asleep, neither heard anything when the dog began tearing and nipping at the infant’s face. Easy precautions were not taken.
Initial reports were that the baby was in the family bed, between the parents.
Now I slept with my babies. I woke up before I shifted an arm.
But these parents didn’t wake when the puppy jumped on the bed between them and started chewing on the baby? It did a lot of damage for a tiny dog.
So “sudden infant death syndrome” becomes, there’s a good chance they smothered that child by overlaying her.