Our trundle bed is great for sleepovers. When other dolls comes over to visit just pull out the drawer which contains a second mattress. It can also be decorated like a daybed if that is your choice. All of our doll furniture is sized for 18” dolls like the American Girl®, Our Generation®, and other such dolls. All beds come with the mattress. The trundle bed measures 24 x 12 x 11 inches high.