A child safety seat includes a support base having a stop, a sliding carriage, a rotary platform having a follower part, and a child seat. The sliding carriage is slidable relative to the support base between a retracted and an extended position, and the child seat and the rotary platform are rotatable together relative to the sliding carriage and the support base between a forward and a rearward facing position. While the sliding carriage is in a position other than the retracted position, a rotational movement of the child seat and the rotary platform is limited by a contact between the follower part and the stop that keeps the child seat and the rotary platform apart from the forward facing position, and the stop is located outside a travel path of the follower part when the sliding carriage is in the retracted position for rotation of the rotary platform to the forward facing position.