Abstract: A convertible infant's crib comprises a headboard and footboard, each consisting of separable upper and lower units formed of interconnecting slats and panels and having integral legs. The upper endboard units may serve to form the headboard and footboard of a youth bed. The crib has removable sides and a mattress support structure adapted for lowering the mattress height as the infant grows. In order that the same mattress may be used in both the crib and the bed, the crib mattress support structure may also be used in the converted youth bed.