Hesperian Health Guides
How the Body Changes
The bodies of people who can become pregnant go though many important changes during their lives—at puberty, during pregnancy and breastfeeding, and when they stop being able to become pregnant (menopause).
During the years they can become pregnant, their bodies change before, during, and after the time of their menstrual periods. The parts of the body where many of these changes happen are the vagina, womb, ovaries, fallopian tubes, and the breasts. Many of the changes are caused by chemicals the body produces called hormones.