In this paper we review the substantial new research showing the significant improvements in access to health coverage for women of childbearing age achieved through the adoption of the Affordable Care Act’s (ACA) Medicaid expansion. Better health coverage is important not just for women who are pregnant but also for women well before they become pregnant and well after childbirth. The American College of Obstetricians and Gynecologists (ACOG) recommends women have access to continuous health coverage in order to increase preventive care, reduce avoidable adverse obstetric and gynecologic health outcomes, increase early diagnosis of disease and reduce maternal mortality rates.4 Research also finds that Medicaid expansion has an important role in reducing the significant and persistent racial disparities in maternal and infant health. And finally, new studies show that healthier mothers mean healthier infants— another benefit for states that expand Medicaid.