If you were born in the United States, probably the first doctor you ever laid eyes on was an obstetrician, a medical doctor who delivers babies.
In many parts of the world, it’s more likely that a midwife would welcome you into the world. But even though an obstetrician is a medical doctor and can be male or female, the name goes back to the Latin word for midwife, obstetrix, the woman who "stands in front [of the woman having the baby]." Obstetricians are often called “O.B.,” for short, and an O.B. who also treats diseases of the female reproductive system is called an “O.B.-G.Y.N.,” “obstetrician-gynecologist.”