How long does it take till the baby is a toddler? I feel like it takes forever.

Around 7 sim days I think...Make sure ageing is turned on

7 days with normal lifespan(90 days). If you want it to be faster just adjust the lifespan in the options menu. And make sure you turned the aging on.

Eh, I have no idea what speed I'm set on, but for me it takes 3 days - I think. :/

Well it depends...if you want longer you can go to options and make it longer or shorter...i make mine like really long so my sims live to be really old..or at least thats what it feels like. I think the max is somewhere around 960..something like that. But i usually make that after they're a child so that it dosnt take forever for the baby and toddler to grow up. But i think the average is 9 sim days. :D

15 days