Hi Maria,
Thank you so much for visiting the Disney Parks Moms Panel with your question. I remember visiting Walt Disney World with my daughter when she was a baby. It was amazing to see the magic through her eyes!
I am happy to let you know that there are attractions that you can take your daughter on at Walt Disney World. Take a look at this
Disney Parks Blog post with a list of height requirements for attractions. If there is not a height requirement listed, your little one can ride. This Disney Parks Blog post includes a chart for Magic Kingdom, as well as links for charts for Epcot, Disney's Hollywood Studios, and Disney's Animal Kingdom. When my daughter was little, I think that her favorite ride was
it's a small world. She would ride and look around at all of the colorful dolls and scenery. She would ride this attraction over and over!
As to a nursery, there is not a place where you can drop off your little one; however, there is a place where you can go to take a break with her. These are the
Baby Care Centers, and there is one located in each of the four Disney theme parks. These offer a calm, quiet place to take a break from the theme parks. They have changing and feeding areas, and each even has a private nursing room. I found the Baby Care Centers to be invaluable when my daughter was little.
I hope that these thoughts are helpful for you, Maria! Please do let us know if you have any further questions.