The Colby 4-in-1 Convertible Mini Crib with Trundle is a more compact, space-efficient version of the customers' Favorite Colby 4-in-1 Convertible Crib with Trundle. It features clean lines and a spacious, built-in Trundle for a beautiful and practical nursery. The Colby mini crib grows with your child with its four different mattress height positions and converts into a mini toddler bed, daybed, and twin-size bed to grow with your child (conversion kits sold separately).