Abstract: The stroller comprises a frame and wheels supporting the frame. The stroller can at least be wheeled over a ground surface in a horizontal direction of movement, wherein at least one wheel is movable in a vertical direction with respect to the frame. At least one wheel is simultaneously movable in a vertical direction and in a horizontal direction parallel to the direction of movement with respect to the frame.

Abstract: A stroller includes at least one adapter, by which a first child seat is configured to be detachably connected to the stroller. The stroller further includes at least one connecting piece, by which a second child seat is configured to be detachably connected to the stroller. The at least one adapter is movable from at least a first position, in which the first child seat is configured to be detachably connected to the adapter, to at least a second position connected to the stroller, in which the second child seat is configured to be detachably connected to the connecting piece.