A computer-implemented method for detecting an unattended living presence in a vehicle having at least two doors, comprising determining, before the vehicle starts moving, a first total number of vehicle door openings utilizing a non added-on door sensor integrated in the vehicle, each of the door sensors is associated with at least one of the at least two doors and is indicative of a door state, wherein each opening of a door indicates a change in a door state of a door, out of the at least two doors, from a door closed state to a door open state; determining, after the vehicle has stopped moving and until being locked, a second total number of vehicle door openings utilizing the non added-on door sensors; and in case the first total number exceeds the second total number, outputting an alert on a possible unattended living presence in a vehicle.