Like fleshy, diaper-wearing cars, infants in The Sims 4 have been "tuned up", making them faster to feed and change, and it's easier to clean up their poop

https://www.rockpapershotgun.com/like-fleshy-diaper-wearing-cars-infants-in-the-sims-4-have-been-tuned-up-making-them-faster-to-feed-and-change-and-its-easier-to-clean-up-their-poop