Hi @moonduzk1,
There are a few prerequisites to be able to grow a baby into a toddler. First of all you need to be able to bake a birthday cake (Level 11) and to complete A quest for toddlers.
You'll find more information in our FAQs:
Check also Adding, Editing & Deleting Sims from Firemonkeys' website.
Let us know if you have more questions.
