Abstract: Infant accommodation apparatus supported in normal use on a flat horizontal surface. The apparatus includes a support device having, in a vertical plane, a constant circular or oval-shaped cross-section along its extent. The support device has an inner enclosure wall which is an inwardly facing upstanding enclosure wall which defines an infant accommodation region in which an infant may be positioned in use. The inner enclosure wall is endless and defines an endless non-circular enclosure around the infant accommodation region. The maximum diameter of the infant accommodation region is in the range 20 to 50cm, and the inner enclosure wall includes, when viewed from above, three curved apex regions separated by curved side regions. The support device further includes an outer enclosure wall which is an outwardly facing upstanding enclosure wall. The outer enclosure wall, when viewed from above, is non-circular and symmetrical about each of three vertical planes angled at 120° to each other.