Hi Arnaldo,
Thank you so much for visiting the Disney Parks Moms Panel with your question. We on the panel love helping guests to plan magical vacations!
I have great news for you. Walt Disney World offers
Rider Switch Service, which will allow you to do just what you are asking about. To use Rider Switch Service, you, your wife and your baby would approach a cast member at an attraction and let them know that you want to take advantage of Rider Switch Service. You will be given a Rider Switch Pass. If you are riding first, you will go through the regular queue, and when you are done, exit and find your wife and baby. Then you will take over watching the baby and give your wife the Rider Switch Pass. She will give the pass to a cast member at the attraction and will be able to ride without going through the regular queue. Please see the link that I provided earlier for a list of attractions offering Rider Switch Service.
Since you mention that you are traveling to Walt Disney World with a baby, do take advantage of the
Baby Care Centers. The Baby Care Centers are located in all four theme parks, and are a great place to change and feed your little one, or to simply take an air conditioned break when your little one needs one.
I hope that this information is helpful for you, Arnaldo! Please do let us know if you have any further questions.