A child safety seat includes a seat shell, an extension member connected with the seat shell, and a front and a rear foot respectively connected with the seat shell and movably linked to the extension member. The seat shell has a bottom surface capable of resting on a vehicle seat. The extension member is movable between a first position where a forward end of the extension member extends forward from the front end of the seat shell, and a second position where the extension member is retracted toward the seat shell. The front foot and the rear foot are movable relative to the seat shell to adjust the seat shell between a first and a second angular position, the seat shell being in the first and second angular position when the extension member is respectively in the first and second position.