Jessica,
That is a great question, thanks!
Hitting two parks in a day is a very achievable plan. When my family travels to Walt Disney World we always go to a park in the morning, then back to the resort in the afternoon for some pool time, a nap, or some other relaxing escape. It gives us the energy for a return to the parks for the evening.
Some evenings we go back to the same park from earlier in the day, but other times we switch things up. We especially like to hit
EPCOT in the evenings, due to their wide array of dining options from the nations in the World Showcase area.
But perhaps you want to do it all without a break? My concern would be your 1-year old getting tired. If that happens you can always take them to the
Baby Care Center for a rest. But the really important thing to do is to plan how you move around between parks. I recommend that you pair visits to
Disney's Hollywood Studios together with EPCOT. You can start at Hollywood Studios in the morning, then use the
Disney Skyliner to get to EPCOT for the afternoon and evening. Again, this helps if you want some fun dinner options, and most of the World Showcase is closed in the morning anyway.
I also think a pairing of
Disney's Animal Kingdom Theme Park and the
Magic Kingdom Park makes some sense. The Animal Kingdom is more lively in the morning, as are the animals in the exhibits. Then the afternoon and evening at the Magic Kingdom make for a great day.
I would caution you on one thing. The Magic Kingdom has a lot more to to than any of the other parks. Especially for kids. You really don't want to make the mistake of not planning as much time there as you can. So while each park holds its own special magic, for your kids that will be the featured destination. Consider that when you balance how much time at each park.
Write me back if you have any follow-up questions, OK?
Have a Magical Vacation!
Doug