The diameter of the cervical opening in non-pregnant women is usually around 1 to 3 millimeters, and after vaginal delivery the cervical opening becomes transverse, and the diameter of the cervical opening is around 5 to 10 millimeters, and the exact size varies somewhat from one individual to another.
The diameter of the cervical opening is about 1 to 3 millimeters in the non-pregnant state; the diameter of the cervical opening is about 5 to 10 millimeters in women who have experienced a natural birth; the size of the cervical opening is not fixed at each period of pregnancy in a pregnant woman, and changes from time to time as the gestation period increases, which varies from one person to another.
At the end of the first trimester, the cervical opening can open up to 10 centimeters, as the cervical canal shortens with the woman’s contractions.