Young adults and adults can try for a baby. There is no "Try for Baby" option for any younger or older sims. The only exception is senior males – they can try for a baby with a young adult or adult female, though conception can be significantly harder. In order to try for a baby, two sims of the opposite gender must have a relationship of "Romantic Interest" or higher. A lullaby-like melody will play if the sim has conceived, although on rare occasions it may not play.
