Bullshit! Having a baby doesn't permenantly change the shape of a body. If this were the case, bones would break during birth.  The pelvis can get and stay wider after giving birth! Sometimes it bounces back and sometimes it stays wide. Still, bone =/= fat. A wide pelvis doesn't cause a higher body fat % and rolls. Also you can break your tailbone giving birth.  https://en.wikipedia.org/wiki/Pelvis#In_pregnancy_and_childbirth