Hi Hannah!
Thanks for stopping by the Disney Parks Moms Panel with another question. It's always a pleasure to help out a returning Guest.
Hannah, rooms at Disney's Pop Century Resort and Disney's All-Star Movies Resort sleep up to 4 Guests plus one infant under the age of 3 in a pack 'n' play crib. If it is just you and your little princesses it should be fine reserving one room. If another adult is traveling with you and you plan on bringing all 3 girls who are all over 3 years of age, you would need to reserve 2 rooms at these hotels. Walt Disney World does have a couple of options for Guests who have a party of 5.
Disney's Port Orleans Resort-Riverside offers rooms in the Alligator Bayou section of the Resort that sleep 5; as well as
Disney's Caribbean Beach Resort whose rooms have recently been renovated to host up to 5 Guests. Both of these Resorts have 2 queen sized beds as well as a small pull down bed that is perfect for a little mouseketeer to sleep on. My children argue about who gets to sleep on the pull-down bed and we usually have to play a fierce game of paper, rock, scissors to decide who gets the adorable bed.
I hope this has helped answer your question Hannah. Please visit us again if we can assist you in the future. We love to help Guests have the most magical time possible on a Walt Disney World vacation.
Dream as Dreamers Do,
~Jen