Having a toddler in my actual game I also can confirm now that the bug has gone or does at least not occur every time like in the past.
There is now a glitch where all, and I mean all of the female children in the game are heavier than they should be. And I am not being inconsiderate of other people's weight and feelings. Because in every Sims 4 Lets Plays that I watch regularly, every single female baby has aged up to be a heavier child. (including my own sims in several different saves) This happens even if the parents are very thin too. I just thought I would share this issue.
I finally figured out what is happening.
My Sims grow bigger just if the Sims meet with another one generated by the own game.
So if someone from my active family has a baby with a homeless Sim it will grown with great belly and feet. The problem is all future generation will have the same genetic in these body parts even if I change in CAS.
