: Adult Sims can now perform highly detailed caretaking actions, including breastfeeding, bottle feeding, bathing, and baby-proofing doors to manage an infant's mobility. Significant Updates to Newborns

While the infant stage received the most attention, the existing stage was also overhauled to feel more integrated into the game's genetic system:

: For the first time, toddlers and children can interact with newborns by "entertaining" them at the bassinet. New CAS and Build/Buy Features