Obstetrics and gynaecology (OB/GYN) is a medical specialty encompassing the care of women during pregnancy, childbirth, and postpartum, as well as the diagnosis and treatment of diseases of the female reproductive organs and related health issues. Here's a more detailed explanation: Obstetrics: Focuses on the care of pregnant women and their babies during pregnancy, labor, and delivery, and the postpartum period. Gynaecology: Deals with the reproductive health and functions of women, including the diagnosis and treatment of diseases of the female reproductive organs. OB/GYN: Doctors with both certifications can handle everything from general reproductive health to the delivery of a baby.