Because a child is delivered vaginally, there is a difference between the cervix and hymenal margin of a woman who has had a child and a woman who has not had a child, because the child is delivered from inside the uterus. The cervix of a woman who has had a child is in a zigzag shape, while the cervix of a woman who has not had a child is round, which is generally visible to the doctor. In addition, you can continue to look at the hymen edge of the outer vaginal opening. If you have not had a child, the hymen edge is intact; if you have had a child, you can see that there is a tear in the hymen edge, which is usually a sign of having had a child.