A maternal-fetal medicine (MFM) subspecialist is an ObGyn physician who care for high risk pregnancies including multiple pregnancies, placental abnormalities, fetal anomalies, genetic disorders, nutritional issues and infectious diseases. MFM subspecialists are high-risk pregnancy experts. For pregnant women with chronic health problems, MFM subspecialists work to keep the woman as healthy as possible while her body changes and her baby grows. MFM subspecialists also care for women who face unexpected problems that develop during pregnancy, such as early labor, bleeding, or high blood pressure.