How are an ob gyn and a gynecologist different?

OB=baby: The OB stands for obstetrics. The training for all ob/gyn's includes both obstetrics and gynecology. Thereafter, doctors may choose to do both or just one - either OB or gyn. The OB gyn takes care of delivering babies and prenatal care and also gynecologic issues. The doctors who limit their practice to gyn issues and do not deliver babies are gynecologists.

Depends: A gynecologist may or may not do OB , whereas, an OB/Gyn does do Obstetrics.

OB/Gyn : An OB/Gyn is an obstetrician and gynecologist. An OB/Gyn takes care of pregnant and non pregnant patients. A gynecologist takes care of only non pregnant patients.