Abstract: A holder for an infant's cradle consists of a platform on which a cradle may be rested and retained, and a spring mounting for the platform which permits the platform to be rocked, somewhat in trampoline fashion, by the child's own exertion or that of the parent. The mounting comprises two U-shaped spring members each having one limb as part of a floor support for the holder, and a second limb adjustably securable within longitudinal socket tubes fixed on the sides of the platform.