Despite its involvement in more than 200 enzyme systems in the body, its nutritional importance is often overlooked. Zinc plays an integral role in conception, maintaining pregnancy, fetal development, labor, postpartum recovery and breastfeeding. Sources of zinc include high fiber grains, seeds, eggs, legumes, Brazil nuts, herring, meat, parmesan and other hard cheeses.

Fertility

Zinc is one of the first supplements recommended for fertility problems. For further information check out Female Infertility. Zinc is also an important component of semen. Deficiency in males is linked to a low sperm count and is thought to produce sperm that are too weak to penetrate the egg. Zinc deficiency can be caused by the following: Anorexia nervosa, fad diets, ‘weight-loss’ diets, a strict vegetarian diet or restricted protein diet, alcoholism or substance abuse and long-term intravenous therapy. Female oral contraceptives are also known to decrease zinc levels if taken consistently over long periods of time. Because zinc is closely linked to hormone production, women who stop taking the pill in the hope of conceiving often require six months or more for their hormones to balance and their menstrual cycles to regulate. During this time, a balanced diet and zinc supplementation is strongly recommended. The recommended daily dosage of zinc varies from 20-60 mg, ideally to be taken on an empty stomach and separately to other supplements other than copper.

Medical Intervention

An adequate supply of zinc is needed for both you and your baby’s development throughout pregnancy. Deficiency is thought to cause miscarriage, fetal growth retardation, stillbirth and congenital handicap. An important component of collagen, zinc is necessary to promote the health and elasticity of the skin and connective tissue to safeguard against pre-term rupture of the membranes. It also promotes elasticity of the perineum during labor and birth. If the perinea area is able to stretch readily, tearing or episiotomy is less likely. It is known that women who are zinc deficient tend to have longer labors and often require more medical intervention. Zinc is required in the production of prostaglandins and hormones essential to initiate labor and because it is involved in the metabolism of complex carbohydrates, it is also important for energy production.

Labor

Deficiency is also linked to weakening of the uterine muscle tissue, affecting the efficiency of labor contractions.
As your pregnancy nears its end, hormonal changes prepare your body for childbirth. Zinc packs into the placenta and copper levels rise. Zinc and copper work together to balance each other and if one is deficient, the delicate balance is adversely affected. In Australia, copper deficiency is rare as drinking water flows through copper pipes, supplying adequate amounts of copper. Following the birth, zinc levels fall as the placenta is expelled. However, copper levels remain high and consequently the inadequate zinc is unable to stabilize the balance. This is thought to be one factor responsible for post natal baby blues and depression.

Placental Zinc

A healthy placenta is the richest known source of zinc, containing between 300-600 mg, depending on its size. In the animal kingdom and in many traditional societies, the placenta is eaten, valued for its high nutrient content. Eating the placenta immediately restores postpartum zinc levels.
Furthermore, zinc is known to heal cracked nipples, speed tissue repair and reduce chances of infection following tearing or episiotomy. Zinc also supports milk production and enhances muscle contraction necessary to promote involution, or shrinking, of the uterus during postpartum recovery.

Baby's Zinc

If your baby suffers an injury during birth, it will recover more quickly with less likelihood of infection if you choose to breastfeed and your zinc level is adequate.

It is also known that a baby deficient in zinc is likely to cry more and be less settled. If you are suffering from post natal depression, and statistics show that almost a third of women in the western world experience some degree of depression, then your baby is likely to sense this and may become easily agitated. Thus begins a cycle that may be difficult to break. Research has revealed that nutritional status is linked to maternal instincts and behavior. In one study using rats, it was found that zinc deficient mother rats neglected their offspring.

(Source: http://www.ninemonths.com.au/the-importance-of-zinc/ )