A new approach is proposed that contemplates system and method to backseat child safety in a passenger vehicle by preventing locking of the vehicle in a parked state when at least one of its backseats is occupied. Specifically, one or more backseat sensors are each configured to detect if one of the backseats of the vehicle is occupied by a passenger. Upon accepting signals from the backseat sensors indicating that at least one of the backseat is occupied, a vehicle controller is configured to disallow locking of the vehicle in the parked state. The vehicle controller is configured to only enable locking of the vehicle when a backdoor corresponding to the occupied backseat has been opened as detected by one of a plurality of backdoor sensors, which generates and provides a backdoor signal to the vehicle controller when the corresponding backdoor to the occupied backseat is opened.