Toddlers turning into fat children

All of my toddlers are fat and it's getting annoying...all the clothes look horrible on them and they just walk and run soo slow! I heard having them "round around" for about eight hours can shed off the weight but It hasn't worked for me. I don't' think it's possible for them to be any fatter. I used to feed them if they weren't hungry because I use my sims to make series (like a tv show but made with sims and not publicly shared) so when I had to film a meal scene sometimes the toddler wasn't hungry but had to eat at the same at as the parents. When I figured out that's why they were getting so fat, I waited until the tot was hungry or would put her in her high chair with food but not let her eat it and instead throw a tantrum or cry just so have something to use for a meal scene. Anyone know how to get rid of toddler fat? I don't want to wait until they become kids. I haven't been allowed to edit them in CAS after creating them in CAS so I can't just change the weight. When planning her outfits it doesn't let me change her weight yet I can change her eye size- which I've done by accident many times. I was saving them in CAS and then replacing the one I was playing with the original skinny version of her but then I had to her to achieve all of her skills all over again.