Abstract: An adjustable-sized, readily assembled and readily disassembled baby crib made up of a series of plastic tube sections and plastic tube fittings. An invertible bottom portion is useful per se as a small short crib and, when inverted, is useful as a base portion of a taller playpen type of crib. This bottom portion has a planar assembly, a series of identical vertical tube sections, from upper sockets of the planar assembly, and a first generally rectangular assembly. In the playpen-crib the bottom portion is inverted and an upper, second generally rectangular assembly substantially identical to the first generally rectangular assembly and is connected to the long vertical tube sections.