@simgirl542
MC does not cause such deformations. If you do not have CC clothes or skins, then the game caused this deformation. You can try to fix the game on Origin, but of course it will not reverse these changes. I assume you're using Story Progression, and I've discovered that when you play for a long time and the fourth generation of sims is already grown up, some sims really need a correction because they look terrible.
But if you have MC, you can easily improve the appearance of your sims. I always correct it.
In addition, you can set the MC to let children inherit only the appearance of their parents