Summary: As the belly gets bigger and heavier, the pregnant mother\’s center of gravity will gradually shift forward when standing. In order to ensure the balance of the body, the shape of the spine of pregnant mothers will also change. Specifically, the pregnant mother\’s waist will lean forward more, her hips will lean back further, and her neck will be stretched forward more forcefully. Such a posture doubles the load on the muscles directly connected to the spine. As the belly gets bigger and heavier, the pregnant mother\’s center of gravity will gradually shift forward when standing. In order to ensure the balance of the body, pregnant women