My female sim has had two successful pregnancies and now has two children (eldest is a teen, youngest child) I made her body shape very slim, but have noticed (more particularly after her second ch...
My Sim was very slender, gained a wee bit of weight after having her child. I had her jog around a bit; she loves the outdoors anyway. Also had her eat salads for a bit. Weight came off. In the meantime, her husband aged from YA to adult and has started to get a bit of a paunch. I'm leaving him alone, though, because he's based on a real person and that person did gain weight as he got older :-D