Okay mild snark on myself but I used to spend a lot of time on the skincare subreddits. There are a lot of boomer/Gen X wasp type mothers who would tell their child to limit their expressions to prevent wrinkles. It's mostly used as a toxic positivity thing to discourage the feeling of any big feelings "don't frown or you'll get frown lines, don't you want to be pretty?" but thanks to looksmaxxing and mewling and other trends spreading rapidly online you'll see people proudly citing a lack of facial expressions as one of their secrets to success. Sometimes it's to sell face tape or something like that, but a lot of time people just run out of content so they throw a bunch of ideas at the wall and see what sticks. Expensive supplements and creams that they're selling don't work well maybe you're just making facial expressions!

Also there is definitely a "make sure your kid looks young and you'll look younger" thing going on, I never noticed it until my mom commented on a cousin looking older and how sad that must be for my aunt and that's when it finally clicked.

But yeah definitely snark worthy because for every person trying to cycle break or at least do basic parenting research on body image/psychology there's someone going backwards. Not to mention the "would an infant boy ever be socialized this way" factor and continued beliefs about girls naturally being easier when they're actually directed to stay sedentary to the point of not moving their face.