A toddler Sim in CAS.

A Toddler is the second age in Sims 3, and the youngest to choose from in CAS. Unlike a baby, the toddler is bigger, can move, learn to walk, talk and potty, play, and do a few more interactions.

If you use the normal lifespan, they will age up in 7 days, unlike Sims 2, where they age up in 4.