The term DOCS WHO DELIVER refers to two types of medical professionals: obstetricians (OBS) and obstetrician-gynecologists (OBGYNS). An obstetrician is a doctor who specializes in pregnancy, childbirth, and postpartum care. An obstetrician-gynecologist is a doctor who specializes in both obstetrics and gynecology, which is the diagnosis and treatment of diseases and disorders related to the female reproductive system. Both types of doctors are responsible for delivering babies.