A baby stroller includes a frame and a portable cradle is removably connected to the frame. The portable cradle includes two pivotal devices which are removably connected to two support devices on the frame. The pivotable device each includes a first part and a second part which is removably connected to a third part of the support device. A sleeve is movably mounted to the first part and connected to a pin which is inserted into a notch in the second part and one of positioning holes in a third part of the support device such that the portable cradle can be easily adjusted the inclination. The second part is removably connected to the third part of the support device. A front wheel assembly is connected to a front end of the frame of the stroller and the front wheel part is removably connected to the base of the front wheel assembly so that the front wheel part can be easily replaced.