Pregnancy body changes different per sim? Body changes after multiple births?

I had a sim who was pretty fit but gotten huge during her pregnancy (she only had one baby, a boy) and lost the weight but certain areas did seem to get a bit larger/wider after she gave birth. She was my Vampire sim who married Celeb.

Another sim just stayed pretty slim during most the pregnancy and was hard to tell she was pregnant.

I like how each pregnancy for sims is different.