A gynecologist is a doctor who specializes in women's reproductive health. Obstetricians care for women during their pregnancy and just after the baby is born. They also deliver babies. An ob-gyn is trained to do all of these things. Your ob-gyn will deal with some of the most important health issues in your life, including birth control, childbirth, and menopause. An ob-gyn can also screen for cancer, treat infections, and perform surgery for pelvic organ or urinary tract problems.