Abstract: A baby walker includes a chassis with casters mounted to an underside thereof and an upper frame having a seat mounted thereon. The upper frame further includes two racks mounted to an underside thereof. Two pairs of cross-hinged first beams and second beams are mounted between the chassis and the upper frame. Two engaging members are respectively, slidably mounted to the racks. A connecting beam which interconnects upper ends of the first beams has two ends respectively connected to the engaging members to move therewith. A pawl is pivotally mounted to each engaging member and is biased to engage with one of a number of teeth formed on the associated rack. An actuating rod has two ends respectively, securely attached to the two pawls to move therewith.