A child motion device has a frame assembly configured to rest on a floor surface. The device also has a drive system and a cantilevered arm extending from part of the device. 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 move the arm through a partial orbit around a generally vertical axis of rotation. A child seat is supported on the distal end of the support arm.