HI Bethany!
We took our 4 month old to Walt Disney World just a few months ago, and we had a magical time! There are a few attractions in each theme park where you can hold or carry your baby in a baby carrier, while still enjoying the experience. We had a wonderful time on "it's a small world", Spaceship Earth,
The Great Movie Ride, and Peter Pan's Flight.
In order to experience attractions where smaller children aren't allowed to accompany you and your husband, you'll have to take turns entering the queue while the other person stays with your baby. My husband and I did this. It was a bit awkward to ride without each other, but we still had a blast!
I hope this answers your question, Bethany. If you have any other questions, please feel free to ask us at any time. We're always here to help.
Have a fantastical Disney day!