Dear sweet Jesus! How? How do you ever forget your child is with you? How? I want to cry. I’m at work, though. Damn, this makes me mad.
1. Car seats are supposed to be in the back and are sometimes rear-facing.
2. Sleeping babies are totally silent and car rides make them sleep.
3. Change of normal daily routine, e.g. different parent is supposed to drive or drop off kids.
4. Parent has other things on their mind.
5. Long enough drive for parent to be thinking about #4, forget about #3, and not be reminded because of #1 and #2.
There must be a lot of close calls, where the parent forgets but remembers before it's too late or someone else notices the kids.
You don't. Only an irresponsible moron forgets. I've forgotten my camera in the car. Or a soda bottle. Or my hat. But they aren't number one in my life. My kids are number one, and are never forgotten. You get them out of the car, same as you make sure you have pants and shoes on when you leave your house. No excuse. Ever.