Obstetrics and gynecology (OB/GYN, OBG, O&G) are the two medical and surgical fields specializing in women’s health needs related to the female reproductive system. An obstetrician/gynecologist is a physician who specializes in this discipline, which includes pregnancy/prenatal care, childbirth, and medical disorders of the female reproductive organ. See below to locate an OB/GYN in Portland, ME.