I don't have kids and I don't plan to, but instead of all the smart crap in cars, why don't car manufacturers put some kind of car seat detection in? Like a little alarm that plays if you walk away from your car with a baby or child in it?
They can tell if someone's in a seat without their seatbelt, they should be able to work out a way to detect car seats too. This is 100% preventable.
Hell, not even car manufacturers. If someone made a Hackathon-type event where the goal was to make the best baby alert system, I'm sure there's at least one smart person out there who could crack this.