People are surprised to learn leaving your kid alone in the car is now frowned upon.

If you're a millennial or older, think back to the first time you were left to your own devices as a kid. Chances are you were pretty young.

Today, parents who leave their kids to fend for themselves — even for short periods of time — are frowned upon. Big time.

Writer Anne Helen Peterson tweeted in disbelief that she was recently "blown away" by this new parenting practice. She recently learned that "you can't even leave, like, a 5th grader in the car when you run into the store."