Abstract: A walker-jumper comprises a support member carrying a seat for a child, a base member, and a collapsible and expandable frame connecting the support and base members to allow adjustment so that the feet of the child can contact the ground to propel the walker-jumper. The frame connection to the support and base members is by way of a slidable mount for permitting the members to be expanded to a desired one of several expanded positions so that the distance to the ground may be controlled for different sized children. The frame passes through a mounting member slidably carried below the support member and a lock engages the mounting member to fix the base and support members in the desired expanded position. After being locked in place, the frame is yieldably coupled to the mounting member to allow limited movement of the frame relative to the mounting member, responsive to bouncing movements of a child.