It has been suggested that low serum zinc levels may be associated with suboptimal outcomes of pregnancy such as prolonged labor, atonic postpartum hemorrhage, pregnancy-induced hypertension, preterm labor and post-term pregnancies, although many of these associations have not yet been established.
Courtesy: Ota E, Mori R, Middleton P, Tobe-Gai R, Mahomed K, Miyazaki C, Bhutta ZA. Zinc supplementation for improving pregnancy and infant outcome. Cochrane Database of Systematic Reviews 2015, Issue 2. Art. No.: CD000230. [DOI: 10.1002/14651858.CD000230.pub5]