After giving birth, the bones at the front of your pelvis can sometimes move apart without breaking. This area is called the pubic symphysis. This is where the 2 pubic bones meet with a piece of cartilage in between. During pregnancy, these bones can separate a little bit, about 4-5 millimeters, due to pressure and hormones. Sometimes, they can separate up to 9 millimeters. If the separation is more than 10 millimeters, it is called pubic symphysis diastasis (separation). This can cause pain in the lower part of your pelvis, especially when you move or walk.