Posted by Douglas R. from Sears Oxmoor Center:
I recommend the Twin size Amalie Select by Sealy. 7" thick, and perfect for small children. Just a reminder....If there is no deck, you may need a twin bunkie board to go under the mattress. Just make sure you don't have the mattress lying directly on rails or slats only, as it will eventually sag through the gaps. I would also recommend a Premium Mattress Protector from Protect-A-Bed. Will protect against bed bugs, dust mites, pet and other airborne allergens, and is waterproof. They carry a 10 yr warranty and are washable.