Hi Medora,
We first took our daughter to Walt Disney World at seven months old, so we considered the best way to enjoy the parks with a baby.
While I think that you would find enough for your baby to be happy with at any of the parks, since you can only do two, I'm going to recommend Magic Kingdom Park and Epcot.
Magic Kingdom Park is truly magical with a baby. Rides which you may enjoy with your baby include Peter Pan's Flight, Tomorrowland Transit Authority People Mover, Jungle Cruise, or a ride on the Walt Disney World Railroad. We have taken our daughter on "it's a small world" on every trip we've ever gone on, and it amazes us how her look of wide-eyed wonder taking in all of the sights on that ride have not changed since she was a baby. There are many shows at Magic Kingdom Park, some of which may not be geared to infants, but which you might enjoy while your baby rests with you. These include Hall of Presidents and Carousel of Progress.
Some people think that Epcot is not for young children, but I disagree. It was the first park that my daughter ever visited. The great thing at Epcot, especially in Future World, is that once you get into a pavilion you can stay there for a while, keeping the baby happy and cool. Attractions that your baby might enjoy at Epcot include Spaceship Earth, The Seas with Nemo and Friends, Journey into Imagination with Figment, and Living with the Land. These are all gentle enough for an infant.
Whichever parks you do visit, be sure to take advantage of the
Baby Care Centers. These are located at each park and include a private nursing room, large changing table areas, and a space for young children and parents to relax and take a break.
Have a great time with your baby at the parks, Medora! Please do not hesitate to ask if you have any further questions.