Zinc deficiency is widespread in low- and middle-income countries. Its deficiency
during pregnancy is thought to be associated with preterm labour, prolonged
labour, postpartum haemorrhage, pregnancy-induced hypertension, growth
restriction, congenital abnormalities, and low birth weight. However, many of
these associations have not been established yet.
Zinc supplementation during pregnancy reduces the incidence of preterm
births by 14%.
Zinc supplementation during pregnancy has no effect on the incidence of low
birth weight, pregnancy-induced hypertension, or postpartum haemorrhage.
The review did not find evidence to support routine zinc supplementation