Hi Valeria! Thank you for visiting the Mom's Panel.
You will be excited to know that there are TONS of rides and attractions you can enjoy with your niece. Quite simply, any ride that does not have a height restriction is available to you and your entire family\.
Click here to view all the attractions throughout the Walt Disney World Resort. In the column to the left, you can filter by park and/or height restriction. To see the rides the baby can go on, you will want to choose "Any Height". For the rides she is not allowed on, check to see if there is a Rider Swap option so your family doesn't have to stand in line more than once for everyone to ride.
When my son was an infant, Magic Kingdom was our favorite park to visit. I think you'll be surprised to see how many attractions your niece can enjoy there.
I hope you and your family have a wonderful time at the Happiest Place on Earth!
Leslie