The birth canal is the passage through which a baby travels during childbirth. It consists of the cervix and the vagina, forming a pathway from the uterus to the outside of the body. The birth canal expands to accommodate the baby's size as labor progresses, allowing for a safe delivery. During labor, contractions help to push the baby through the birth canal. The process is crucial for natural childbirth, and the shape and size of the birth canal can vary among individuals. Medical professionals, such as obstetricians and midwives, monitor this process to ensure the health and safety of both the mother and the baby.