A child stroller apparatus (100) includes a first frame portion (112, 212) provided with a first wheel assembly (120, 220), a second frame portion (114, 214) provided with a second wheel assembly (130, 232), the second frame portion (114, 214) being assembled with the first frame portion (112, 212) for sliding movement along a lengthwise axis (Y) extending from a front to a rear of the child stroller apparatus (100), and a control mechanism (160, 210, 210') operable to adjust a position of the second frame portion (114, 214) relative to the first frame portion (112, 212), the control mechanism (160, 210, 210') including an actuator (162, 242) assembled with one of the first and second frame portions (112, 212, 114, 214), the actuator (162, 242) being operable to drive the second frame portion (114, 214) in sliding movement relative to the first frame portion (112, 212) for modifying a distance between the first and second wheel assemblies (120, 220, 130, 232).