For those who want to purchase the newest premium content separately, the in game store (IGS) is where you need to be! Make sure that you have Shop Mode enabled, and click the “Show only store items” gold button in buy mode. Head over to the children’s section of buy mode, and purchase away!
Thanks to Chris & DotSim for the tip!
BONUS: The Penelope Bed and Victoria Dining Chair are also available for Free!