A child motion device has a frame assembly configured to rest on a floor surface. The device also has a drive system that drives a swing assembly. The swing assembly can include a pair of swing arms having proximal ends and distal ends. The distal ends support a child seat assembly. The distance between the distal ends relative to the distance between proximal ends is adjustable, thereby adjusting at least one motion characteristic of the device. The adjustable motion characteristics can include a gliding motion and a swinging motion.