Hi, Andrea!
I have two suggestions: either one of the 192 Family Suites at the
All-Star Music Resort (in the Value category), or at
Port Orleans Riverside (in the Moderate category).
The 520-square foot, two bathroom family suites, located in the Calypso and Jazz buildings sleep up to 6 (plus one child under 3 in a crib). Each one features a kitchenette with a 4.3 cubic-foot refrigerator, a microwave, a sink, coffeepot, and counter space.
The main bedroom offers a queen bed; the second bedroom has a double sleeper sofa, a convertible twin chair sleeper, and a convertible twin ottoman.
A room at Port Orleans Riverside is a 314-square foot single bedroom with a single bath. There are two double beds and a trundle underneath the bed closest to the door, which will easily accommodate your littlest sleeper. Make sure to confirm the trundle bed is in the room when you make your reservation. And please be aware that the commode and the shower are in the same water closet, so you'll definitely want to try to schedule for that.
Rooms at Port Orleans Riverside are undergoing some pretty extensive renovations; when you call to reserve your room, if you choose this route, ask f you can be put in one of the completed rooms!
I would suggest that you ask a Cast member directly about the air mattress. All of the Resorts have specific occupancy requirements, set in place to conform to State and Federal fire codes. For your safety and comfort, I would definitely advise you to check with the Resort personnel before you make that decision.
Have a great trip!
See you later, celebrator!
-Deborah B.