a convertible carseat / stroller is of the type having a molded plastic shell with lower door panels in the shell and a wheel assembly includes front and rear legs pivotally connected to a common support member within the shell and extensible between a downwardly divergent stroller position beneath the shell and upper retracted position within the shell under the control of a manual release member which is slidable along the support member for the wheel assembly . a handle unit is telescopically mounted with respect to the support member and is retractable into the shell when converted into a carseat . the door panels on the bottom of the shell follow movement of the wheel assembly so as to open in extending the wheel assembly between the shell for use as a stroller and will return to a closed position when the wheel assembly is retracted into the shell .