What Happens To Your Cervix During Birth Or Labor?

4 min read

Giving birth is certainly a lovely experience. Most mothers, especially those who have an uncomplicated pregnancy feel the same. However, it is quite normal to have several doubts related to labor and delivery. This is especially relevant to the first time moms who are unaware of the labor and delivery process. No need to fret about it, as the body is designed in such a way that it will carry the process of birth naturally and safely. The body of a pregnant woman goes through many changes during pregnancy and labor. The cervix is one of the most significant part of your anatomy that plays a crucial role in the whole labor and delivery process. Continue reading to know what happens to your cervix during labor and delivery .
changes in cervix

What Is Cervix?

It is important to know what is cervix in order to understand in a better way about its role and the changes it undergoes during labor and delivery.
Cervix can be described as a tube of tissue, which joins the vagina to the uterus and is commonly called the neck of the uterus. It is made of cartilage with a thick layer of soft tissues surrounding it.

  • There is a narrow opening in the center of the cervix called OS
  • The part of the cervix that connects with the vagina is called ectocervix
  • The part of the cervix that connects with the uterus is called endocervix
  • The area between the ectocervix and endocervix is called transformational zone
What Happens To The Cervix During Pregnancy?

The cervix undergoes many changes during pregnancy. As soon as pregnancy takes place, the OS of the cervix is closed tightly by mucus plug which is a thick gelatinous mass secreted by cervical glands. It completely fills the cervical canal (4 to 5 centimeter long). This thickening of the cervix is the first change that happens to the cervix during pregnancy. As pregnancy progress, the position of the cervix changes – it hardens, softens, become longer and then shorter, dilates, thins etc.

What Happens To The Cervix During Labor And Delivery?

This might be one of many questions the pregnant women ask their doctor. Let us help you with this.

    • As explained above, the changes in the cervix start during the first week of pregnancy. The cervix remains closed during pregnancy to protect and support the developing fetus and the uterus of the expectant mother
    • After that, the cervix softens and elongates. However, during the last month of pregnancy, the cervix undergoes significant changes, which help to indicate how close the labor is
    • The cervix moves to the front of the vagina: Before the last month of pregnancy, the cervix will be around 4 cm long. However, during the ninth month, the cervix starts to shorten and move from the posterior position to the anterior position, pointing forward
    • Effacing: As the baby’s head engages into the pelvis, it presses against the cervix. This is called effacing or the thinning out of cervix or the cervical canal. As the thinning out progresses, the mucus plug, which blocks the cervical passage during pregnancy, gets loose and passes out through the vagina
    • Effacement is calculated in percentage like 25%, 50%, 75% and 100% respectively for 3cm, 2cm, 1cm and fully effaced. Remember the cervical canal is 4 cm long

doctor checking for dilatio

  • Dilation: Effacement is followed by the dilation of the cervix, which is nothing but the opening of the cervix that allows the baby’s head to pass through it. During the contractions, the muscle around the cervix contracts opening the cervix little bit. When the contraction stops, the cervix also relaxes but the opening of cervix continues. As the contraction progresses, the cervix will further open up. This way the cervix goes from fully closed to 10 cms dilation during labor
  • During the early labor, dilation will be around 3 cm, which progresses to 7 cm during active labor, and finally, towards the end of transitional phase it will be 8cm. At the time of delivery, the dilation will be 10 cm. It is during this time, when the cervix is fully dilated, the baby is pushed out through the cervix and delivery takes place
What Are Cervical Tears?

Some minor tears of the cervix are common during a vaginal delivery, especially if the mother is delivering her first child. However, cervical tears are more frequently associated with instrumental deliveries like forceps assisted or vacuum assisted deliveries. The main reasons for the cervical tears are:

  • Instrumental deliveries through the cervix that is not fully dilated
  • Delivery after a precipitate labor or unusually faster labor
  • A cervix that stays rigid, mainly due to previous surgeries like LEEP, which is performed to remove the abnormal tissue growth in the cervix

Though minor tears resolve on its own without any treatment, the major cervical laceration or tears with active bleeding need to be fixed. It is more or less a surgical procedure done in operation theater under anesthesia.

Complications With The Cervix During Labor

At times there can be some complications or problems with the cervix, like:

  • The length of the cervix is usually equal to or greater than 3 cms. If the cervix is less than 3 cms, it can lead to complication such as an incompetent cervix which can cause premature delivery
  • During the pre- labor contractions, the cervix is designed to shorten and widen. But if the cervix shortens without contractions, it is called incompetent cervix and can cause premature labor
  • If this happens, a cervical cerclage is performed, where the cervix is stitched to hold it close. This is rare and only 1% of the pregnant women undergo this procedure
  • In rarest of cases, there are chances that a pregnant woman’s cervix maybe stenotic. This will happen when the cervix opening is tightly shut and it doesn’t dilate or open in anyway. This could be due to numerous reason like any earlier infection, any surgery or just a genetic abnormality

Childbirth is an amazing feeling and achievement but remember that your body has been through a huge emotional and physical turmoil during pregnancy and delivery. So be kind and nice to your body and give it a lot of time to recover.

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