Plausible.

Can we just make mental health issues more easily cared for? So maybe the next person gets some post partum screening, supports, and doesn't kill their kid?

Well, maybe if you took a moment to try to understand the motivations of this person you could acknowledge that there's a chance that this could have been avoided if the mother had better mental health support.

As I said in my first comment, mental health isn't an excuse and she's still a murderer. She needs to face justice for that.

However, understanding the circumstances that led to this provide an opportunity to avoid similar things happening in future.

Not almost unheard of. Unheard of. Both experiencing it at the exact same time does not happen.

Sorry this just isn't true.

SIDS is more of a category of "unexplained infant death", so yes: some of these infants may have blocked their own airways.

However, that's not true of all cases. There's complex neuro-stuff going on that we don't understand and is difficult to research.

We reduce the risk of SIDS by ensuring that kids are less likely to block their airways with blankets and so on, because those are the things we can practically do. We can't fiddle with the neuro-stuff.

If your child dies of SIDS, that does not mean you suffocated them or let them suffocate themselves.

There's a lot of research about this.