Hormonal changes help the skin and ligaments to relax and stretch.
As the uterus becomes larger and the breasts develop the skin in certain women is not able to keep up with this rapid growth. The fibrous and elastic tissue in the skin is damaged and scar tissue is formed. As the stretching process increases, more scar tissue is laid down and the stretch marks increase in width. In order to ease the strain on the skin during pregnancy it is sensible to wear a supporting bra and a comfortable firm abdominal support. An old elastic girdle with little support is not a satisfactory garment during your pregnancy particularly if you have a tendency to develop stretch marks.