Maternal-Fetal Medicine expert witnesses practice in a variety of fields, including high-risk pregnancy management, prenatal diagnosis, and obstetric complications. Some of the most common specialties include preeclampsia, gestational diabetes, fetal anomalies, preterm birth, and labor and delivery emergencies. They can opine on the effects of delayed diagnosis, improper monitoring, substandard obstetric care, and deviations from perinatal guidelines.