They can't really be prevented in most women, but they often fade after pregnancy. Darkening of the skin pigment may occur because of the pregnancy hormones. Some women get darkening of the skin on the face, known as the mask of pregnancy. Many women notice a dark line down the middle of their abdomen. These color changes should disappear shortly after the baby is born.
Constipation can become a problem.
Relieve constipation by drinking plenty of fluids, eating a diet higher in fiber and getting regular exercise. Hemorrhoids can result if constipation isn't resolved. To help prevent this problem, avoid sitting or standing for long periods of time, don't put on excess weight, be sure to walk or do other regular exercise, try wearing supportive pantyhose, and don't smoke. Headaches may occur more frequently. Try to get enough rest and relaxation.