A seatbelt adaptor and a method to be used to improve of the setup of a child safety seat in a vehicle, the seatbelt adaptor comprising a central lengthening device and two connectors disposed at both ends of the central lengthening device. The connectors are suited for the buckles of the vehicle's seatbelts, and wherein the length of the seatbelt adaptor is suited to improve upon the latching of the buckle of the seatbelt that secures a child seated in a safety seat within a vehicle. The geometric shape of the safety seat conforms to the geometric shape of the seatbelt adaptor.