Many women will complain of cramp during pregnancy. Cramp is very common during pregnancy and especially affects the calf muscles. Cramps usually affect the legs, feet and toes, and often strike during the night. Leg cramps in pregnancy are related to an imbalance in the body's natural calcium and sodium salt levels and poor circulation caused the demands of the growing fetus. To prevent leg cramps, make sure you are getting enough sodium, calcium, magnesium, and potassium.
If you find you have leg cramps at night, place a pillow between your knees to improve the circulation. Women can help prevent cramp in pregnancy with foot and leg exercises. Regular, gentle exercise in pregnancy, particularly ankle and leg movements, will improve your circulation and may help to prevent cramp occurring.