The cervix must be 100% effaced and 10 cm dilated before a vaginal delivery. The first stage of labor and birth occurs when you begin to feel persistent contractions.
A fully dilated cervix is 10 centimeters open. This means that when your cervix is measured with two fingers, they can be stretched 10 centimeters across. When you're fully dilated, it's time to push and have a baby.
During the first stage of labor, your cervix will start to open (dilate) and thin out (efface) to allow your baby to move through your birth canal. Dilation starts at 1 centimeter (less than 1/2 inch) and goes all the way to 10 centimeters before there's enough space to push your baby into the world.
When your baby is ready to begin the journey through the birth canal, your cervix dilates from fully closed to 10 centimeters. This process can take hours, days, or even weeks. But once you hit active labor – about 6 cm dilated – it's usually just a matter of hours before you reach full dilation.
Your cervix needs to open about 10cm for your baby to pass through it. This is what's called being fully dilated. In a 1st labour, the time from the start of established labour to being fully dilated is usually 8 to 12 hours. It's often quicker (around 5 hours), in a 2nd or 3rd pregnancy.
If your water (aka “amniotic sac,” “bag of waters” or “membranes”) hasn't broken on its own when you arrive at the hospital, and you're five or more centimeters dilated, your OB might recommend bursting the bag by hand—especially if your cervix seems to be making slow (or no) progress.
The Active Phase of Labor
The second, pushing phase of labor continues after the cervix is fully dilated (open) to 10 cm until the delivery of your baby. It averages 4 to 8 hours but can be as short as several minutes.
Getting up and moving around may help speed dilation by increasing blood flow. Walking around the room, doing simple movements in bed or chair, or even changing positions may encourage dilation. This is because the weight of the baby applies pressure to the cervix.
Try being upright
One of your biggest allies is gravity. When you are upright—standing, sitting or kneeling—the weight of your baby presses on the cervix, encouraging it to open. An upright position may also help get your baby into the best position for birth.
The time between dilating to 1 cm and giving birth varies from woman to woman. One woman may go from having a closed cervix to giving birth in a matter of hours, while another is 1–2 cm dilated for days or weeks. Some women do not experience any dilation until they go into active labor.
It may be hard to talk or move easily. At this point, your cervix will be dilated 3 to 10 centimeters. (Dilating one centimeter an hour is textbook, but like in early labor, it's different for everyone.) If you're opting for an epidural, the time is…now!
In general, once the active stage of labor kicks in, it's a safe bet to expect a steady cervical dilation every hour. Many women don't start really dilating more regularly until closer to around 6 cm. The first stage of labor ends when a woman's cervix is fully dilated to 10 cm and fully effaced (thinned out).
Try to insert the tips of your fingers into your cervix. If one fingertip fits through your cervix, you're considered one centimeter dilated. If two fit, you're two centimeters dilated. If there's additional space in the opening, try to estimate how many fingertips would fit to determine dilation.
Dilation: Your Cervix Opens
Dilation is checked during a pelvic exam and measured in centimeters (cm), from 0 cm (no dilation) to 10 cm (fully dilated). Typically, if you're 4 cm dilated, you're in the active stage of labor; if you're fully dilated, you're ready to start pushing.
Insert your index and middle finger and push your fingers deep inside as far as you can to reach your cervix. Be as gentle as possible to prevent bruising or complications. Assess dilation. You're considered 1 centimeter dilated if one fingertip fits through your cervix, or 2 centimeters if you can fit two fingers.
Theoretically, the unequal walking pattern created by the curb causes the pelvis to open and allows the baby's head to descend. When the baby's head is deeper into the pelvis, there is more pressure on the cervix, causing dilation and effacement. This uneven walk should be done for about 10 minutes.
According to Brichter, sitting on an exercise or birthing ball in neutral wide-legged positions prepares the body for labor by increasing blood flow, opening the pelvis, and encouraging cervical dilation. You can also try birth ball exercises such as circular hip rotations, rocking, and gentle bouncing.
Try to achieve a deep squat with your legs in a “V” position. This position can really help to open up your pelvis, move your baby down, which can also help to dilate your cervix.
During labor, intense contractions of the uterus help move the baby down and eventually out of the pelvis, and into the vagina. These contractions put pressure on the cervix and cause it to expand slowly.
You are more likely to be overdue if you are obese, have never given birth before or if you're over the age of 30. Your midwife or doctor will check that both you and your baby are healthy by giving you ultrasound scans and checking your baby's movement and heartbeat.
Medication: Prescription prostaglandins (either oral or vaginal) may be used to encourage cervical softening and dilation. Mechanical: Mechanical cervical ripening is when a balloon-like device called a Foley catheter is gradually inflated to help push the cervix open.
Laboring down is the process of not actively pushing once the second stage of labor and intense contractions begin. Some people wait one to two hours before pushing, which allows the baby to naturally move down the birth canal. Laboring down has risks and benefits.
Until recently, women have been asked to start pushing as soon as the cervix has dilated to 10 centimeters, but as long as you do not have a fever and your baby's heart rate is normal, there are many benefits to waiting to push until you feel the need to push.
The cervix must be 100% effaced and 10 cm dilated before a vaginal delivery. The first stage of labor and birth occurs when you begin to feel persistent contractions. These contractions become stronger, more regular and more frequent over time.