A multi-function baby carriage comprising: base frames; a back frame installed at rear ends of the base frames to switch between a vertical position and a horizontal position and formed with a U-shaped hanger at its top for being suspended from a user's neck or a headrest of a car; a seat on the base frames to accommodate a baby; and wheel means below the base frames, wherein said wheel means include front and rear wheels, front and rear connectors, a front cross member connecting the front connectors, a rear cross member connecting the rear connectors, each of said front and rear connectors having an end rotatably connected to one of the front and rear wheels and the other end connected to one of axes, wherein said shaft is provided with a ball member, so that when the front or rear wheels are folded or unfolded, said shaft causes the front and rear wheels to move at the same time and said ball member passes through a ball holding member in a forward or backward direction to make said ball member to stop at a front or rear end of said ball holding member, to thereby maintain a folding state or an unfolding state of the front and rear wheels, and wherein said ball holding member has a cylindrical form that can expand in a radial-outward direction and retract in a radial-inward direction.

A child seat includes a seat body, and a first and a second support respectively assembled with the seat body via a first and a second connection. The seat body has a seating surface and a bottom surface below the seating surface, and the first and second support are extendable below the bottom surface. The child seat has a first configuration in which the child seat is attached to a support frame at an elevated position above a ground surface, and a second configuration in which the child seat is converted to a booster seat standing independent of the support frame, the first and second support respectively extending forward from the first and second connection in the first configuration, and the first and second support respectively extending rearward from the first and second connection so that the child seat stands on the first and second supports in the second configuration.

A child seat includes a seat body, and a first and a second support respectively assembled with the seat body via a first and a second connection. The seat body has a seating surface and a bottom surface below the seating surface, and the first and second support are extendable below the bottom surface. The child seat has a first configuration in which the child seat is attached to a support frame at an elevated position above a ground surface, and a second configuration in which the child seat is converted to a booster seat standing independent of the support frame, the first and second support respectively extending forward from the first and second connection in the first configuration, and the first and second support respectively extending rearward from the first and second connection so that the child seat stands on the first and second supports in the second configuration.

A convertible furniture and toy assembly for children, which has a symmetrical base unit and replaceable module elements that can be attached thereto. The base unit contains two side units arranged at an equal distance from its plane of symmetry and at least two connecting elements connecting the two side units. The convertible furniture and toy assembly for children is provided with a stabilizing system in which the side unit of the base unit contains a first side element, a second side element, and an intermediate side element connecting them. The first side element is arranged at a predetermined distance X and the second side element is arranged at a predetermined distance X+Y+V from the plane of symmetry. The stabilizing system preferably also contains at least one connecting member and module elements that can be installed symmetrically on the base unit.