A stroller for transporting a child includes a wheeled frame including at least two base rails interconnected by a cylindrical hub, a spine, and a bracing linkage. A basket attaches to the spine, confining the child and supporting a seat ring. The seat ring includes upper and lower connected concentric arcs having different radii and supports a seat back on its lower arc. The seat back reclines, and the seat ring rotates from center. A seat base is supported on the frame and includes a platform movable between an extended position disposed inside the seat ring and a retracted position withdrawn from the seat ring. The stroller permits the child to be safely and comfortably transported in a standing, seated, or reclined position.