Lifespan

It's set to Long, but I play with Aging Off. However, if any of my Sims were to spawn have babies, the little tykes would be aged up pretty much immediately - as in, as fast as I could get them in front of a cake! I'm iffy on the toddlers, but they'd probably annoy me so much they'd get aged up by the second sim day. :D The kids would probably become teens fairly quickly too.

I had bad experiences with babies and toddlers in Sims 2 - they were just so demanding! The only ones I could stand were the Plant Sim babies. They were easy.