I really hope it's better babies. I play with aging off and have the babies for more than a sim year (and I play with 28 days seasons, which makes a sim year 112 sim days) before I age them up to toddlers. I'm beyond tired of babies the way they are now. They feel more like pieces of furniture than real family members.
Here are some of the babies I've had in my game. Completely identical in appearance and personality:
https://i.imgur.com/3NbJMIc.jpg
Clearly, they're nothing but objects:
https://i.imgur.com/riv5t4g.jpg
https://i.imgur.com/0Au6SPq.jpg