Its been about three weeks now and my infant will age up to toddler only to immediately age up to a child. I play super vanilla, only using the packs for content; no crazy downloads or mods. I've loo...
Ideas
It's happened to me but with a non-household sim -- He was a Teen Wednesday, stayed the night and aged up early Thursday to YA and then went home (after messing with his new trait in CAS with fulleditmode on) and then on Saturday I asked him to move in and I noticed he was an Adult. Ick (used CAS fulleditmode to fix him but still).