That works for pets and adopted kids, but the game doesn't let you delete infants through Manage Households. You need to have a sim physically go to the lot with the infants on it and use a cheat to delete them.
Sometimes I got infants from expand the family question. I just moved all infants via household management to a townie and then delete the household. No need to aging up these infants or play this household. // Not all cheats are access bar in a vanilla game or for console, and I think this cheat is one of this. You need a mod for full access to all cheats as destroy objects etc.
