A child stroller that can grow with the family starts as a single stroller when a second base and standing boards are fully folded toward a first base. The second base can be slid open with respect to the first base to create a space to attach a full-sized second child seat via a second coupling unit. The standing boards may be extended out from the first base at the back that can be used for one foot or both feet, so that a third child can stand on the standing boards. Multiple configurations are provided for the child stroller.