Women's bodies go through an amazing change during pregnancy. As your baby grows within your uterus, it's so amazing to see how your body will accommodate. Your organs will compress, your bladder will descend, your entire body framework will change. The configuration of your framework and the tone of the muscle walls is determined by genetics, age, nutrition, disease, injury, and your everyday posture. I love this website because it has a great slide show of illustrations of how your body conforms.