Colby 4 in 1 Convertible Crib DaVinci Baby Colby 4 in 1 Convertible Mini Crib with Trundle Grey and White Colby 4 in 1 Convertible Crib DaVinci Baby Carter's by DaVinci Colby 4 in 1 Convertible Crib with Trundle Drawer DaVinci Baby Colby 4 in 1 Convertible Crib with Trundle Drawer 29.8x55. 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).