For anyone wondering and I did post it in the infant and Toddler thread but will post it here too. Yes The weight option does appear for toddlers but not infants. I'm happy with this :D Theo here was the test sim I used in my legacy save. Kids also have the option too for anyone wondering.
Thank goodness! I never liked that my toddlers kept gaining weight no matter what they ate, with no way to exercise. Some toddlers are going to have different body types than others, and that's totally fine, but I did not like how every single one of my toddlers always got big. That's just not realistic.
You're welcome. I had to see if it was a option :D
