(Thanks to Israel21c) Israeli start-up Bapeep is developing a car alarm that, when you switch off your car engine, will remind you to take your baby out of the car. On average, 37 US children die every year after being forgotten in a hot car. Bapeep’s Indiegogo Crowdfunding goal is $300,000.
https://www.indiegogo.com/projects/babeep-beep-your-baby-in-mind#home
https://www.youtube.com/watch?v=I8xKTPM7RD0
http://www.timesofisrael.com/infant-left-in-hot-car-rescued-by-police/