Hi, Cecilia! I have some amazing news for you. Any child under the age of three does not count towards resort room maximums, so you are perfectly fine booking a room that will accommodate a party of four. There will be pack and play type of cribs available, or you can squeeze the littles into the beds with the rest of you.
I do want to suggest, however, that if you want to consider a room for a party of six, the
Art of Animation Resort has family suites that are perfect for larger families. They are slightly more expensive than the standard value room, but the space you'll gain is awesome. You'll have an extra bathroom, which is great for potty emergencies, when little ones just can't wait, and you also get a small kitchenette type of set up, with a microwave and small refrigerator. There's also a king size bed in a private room for the grown ups, so if you want to sit up a bit later and talk or watch television, it won't bother the kids in the other room.
Have a great time on your upcoming FIRST vacation to Walt Disney World. I hope it's an unforgettable experience for all of you.