But you can try this> Go into CAS for a different household, create a male Sim. I assume your all girls was because the last few Sims you created in CAS were female. The game sometimes does something weird because of that, and the babies born in game will be one or the other depending on what Sims you were creating in CAS. But create a male Sim and stick them in the family bin. (*you won't have to play them). Then return to your game and see if the next baby born in the game isn't a male. It's a crazy fix but works most of the time. If that didn't work go back into neighborhood view without saving. You never actually have to quit the game, not saving, but can just go to hood view, without saving.