Hi there, Jillian!
The
Pack 'n' Play you will find at
Walt Disney World is a pretty standard, Graco style pack 'n' play. They are about 39" long, 28" wide, and 29" high. In very small numbers and rare instances, there are some resorts that still do have a regular, full size crib available, but you won't find this is the typical offering.
The resorts also offer guard rails for the regular resort beds. These can be requested by calling 407-939-1936 and adding the request to your reservation. The guard rails are never guaranteed, as they are issued on a first come, first served basis, but I've arrived really late at night, after driving down from New Jersey, and I've never had a problem getting the guard rails for the bed.
One other option I can offer is to reach out to an outside service. There are quite a few places in the Walt Disney World resort area that do rentals during your stay, and they can deliver to your resort. My family has used Kingdom Strollers in the past, and in addition to a regular size folding crib, they also have inflatable toddler beds. We've had great experiences with them through the years.
Wishing you the most magical vacation, Jillian!
Anna