Seat belts are designed to safely secure one passenger in the event of an accident. Sharing seat belts is not an appropriate practice to keep children safe in a car.
It should be noted that all states and the District of Columbia have laws requiring children to be properly secured in either child safety restraints or seat belts while in a motor vehicle. Laws detail what types of child safety restraints are required depending on a child’s age, weight, and height. Most states allow children to use adult seat belts once they reach a certain age or at least 57 inches in height. Ages can range from 5 to 9 for children to use a seat belt without a car seat or booster seat.1