A child motion device has a frame assembly configured to rest on a floor surface. The device also has a drive system that defines a generally vertical axis of rotation. An arm extends from part of the device and is cantilevered from the axis of rotation. The arm is supported above the floor surface and has a driven end coupled to and movable by the drive system and a distal end opposite the driven end. The drive system is configured to pivotally reciprocate the arm through a partial orbit around the axis of rotation. A child seat is supported on the distal end of the support arm.