Do you give your Sim children plastic surgery if they don't look pretty enough for you?

Almost all of my Sims are cartoony Disney/Pixar characters so they have huge eyes. All of their kids are born with tiny eyes. I just don't understand that, but it forces me to have to fix their eyes. And then sometimes the kids are just hideous so I modify them to make them look less like Gollum and more like a human.

I never do it. I've always loved to see how my Sims' children look like and how they will look like when they grow up. It's one of my favorite things in this game.
Many times good looking parents can have children that don't inherit their parents good features. It never bothers me. I don't change their looks even when they grow up.

I prefer to see how things play out with a family instead of making them all be perfect. Some of my most beautiful sims are ones that have been made through the game and not by me!!

It has to really bother me for me to edit their features, though. I mean some of the more extremes of Vlad's nose/Chin inheritance levels of bothering me (not that I've had Vlad father a kid directly, but I do have one of his grandkids in my family tree). And even then, I just reduce the severity of the offending feature, rather than remove it completely.

I've only ever done it with game-generated sims. I would never do it with the children of premades or my own sims.

I used to do that when my sims' sons grew up to be pear shaped and that used to happen like everytime. It is not realistic that every male's body is pear shaped. It doesn't happen anymore so there is no reason for me to give my sims any plastic surgery :)

Only if they're sporting some weird feature which is seldom the case lol

My sims rarely have kids to begin with, but if they age up with the no chin glitch or something that is otherwise outrageous, I will edit that slightly. I wouldn't edit them to make them look pretty, just to make them less freaky. I still want to preserve the parents genes the best I can.
However, I do often make kids in cas through the genetics feature and I usually randomise until I get a decent looking kid. Which boils down to the same as I mentioned about born in game sims. I like to preserve the family genetics, but faces that are really off will be tweaked slightly.
I never edit body weight though, then I'd just give the the right kind of ice cream in game ;)

I want to say never, but I did it once when my male sim looked like he was pregnant. All the clothes looked weird on him. So I tweaked his tummy area a bit. I could have probably picked the second option, but usually I get used to their weird features and on the face a lot can be done with just glasses or beard.

Edit: He was a teen. I understood the question as children in general, sims born in game. I see no point in editing children (lifestage) as they change so much when growing up.

I don't edit my children to look cuter or prettier (unless it's story-driven), but I do edit them for the sake of the storyline in my game. For example, sometimes in the story the kid is supposed to be chubby, but in the game he turns out skinny. It's very hard to get a skinny kid to be chubby in The Sims 4 naturally even if I feed him dozens of cupcakes because all of those features usually only start appearing when they age up into teenagers.
I also tweak facial features to reflect their personality more. Eyes, eyebrows, mouth, all that kind of stuff. Believe me or not but it actually helps! I remember one time when my dad came in while I was editing a kid in the Sims. He immediately pointed out that the kid looks very sad, vulnerable and probably has a hard childhood. That was exactly what I was going for.