A three-point seat belt is the most common type of seat belt in cars, which is fastened at three points: one on one side, one on the other side and one above the shoulder. This type of belt provides the best protection because it evenly distributes the forces applied in a crash over the largest area of the body. The pregnancy belt is then designed to properly direct the car's three-point belt, especially the lower part, under the pregnant woman's abdomen. This helps prevent the conventional three-point belt from pressing on the abdomen in a sudden stop or crash.