The widest stretch of the two fingers is about 7 to 8 cm. At 10 cm (full dilation), the cervix should not be present in front of the presenting fetal part (typically the head).
During the transition phase of labor, the cervix dilates to the following sizes: 8 cm, the size of an apple. 9 cm, the size of a donut. 10 cm, the size of a large bagel.
During the active stage of labor, your cervix dilates from around 6 cm to the full 10 cm. (The last part of active labor, when the cervix dilates fully from 8 to 10 cm, is called transition.)
If one fingertip fits through your cervix, you're considered one centimeter dilated. If two fit, you're two centimeters dilated.
Although it is the shortest phase, the transition phase is the most challenging. Transition typically lasts 30 minutes to 2 hours as your cervix fully dilates from 8 cm to 10 cm.
Your cervix will fully dilate from 8cm to 10cm. Contractions during this phase will last about 60-90 seconds with a 30 second-2 minute rest in between. Contractions are during this phase are long, strong, intense, and can overlap. This is the hardest phase but also the shortest.
(Some OBs will go ahead and break your water at 3 or 4 centimeters.) The reasoning behind this: “Artificial rupture of membranes” (popping a hole in the amniotic sac) will usually jumpstart labor by getting serious contractions underway.
A fully dilated cervix is 10 centimeters open.
This is about the size of a bagel, and means that when your cervix is measured with two fingers, they can be stretched 10 centimeters across.
Doctors have to wait until the cervix is at least 4 centimeters dilated before doing an epidural. Otherwise, the epidural will slow the process down too much. However, once the cervix becomes fully dilated it is too late for an epidural to be given.
The cervix generally needs to be dilated to 10 centimeters before it's ready for the baby to pass through. Your cervix can be dilated to a couple of centimeters for a few weeks before delivery. This softening can cause the mucus plug to be dislodged and come out.
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.
During active labor, your cervix will dilate from 6 centimeters (cm) to 10 cm. Your contractions will become stronger, closer together and regular.
It usually takes from 15 minutes to an hour for the cervix to dilate from 8 to 10 centimeters. Contractions are 2 to 3 minutes apart and last about 1 minute. You may feel pressure on your rectum and your backache may feel worse.
Early dilation often feels like menstrual cramps as the cervical changes cause pain and cramping noticed in the lower part of the uterus. It is the same sensation and location as menstrual cramps. Active labor tends to be felt in a larger area but can be a similar sensation as cramping (with more intensity of course).
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.
The pain experienced during dilation is similar to that of menstruation (although markedly more intense), as period pains are thought to be due to the passing of endometrium through the cervix. Most of the pain during labor is caused by the uterus contracting to dilate the cervix.
An epidural can generally be performed at any stage; it is never too late. This is, however, not the case if baby's head is crowning (within the birth canal).
Many people choose to get an epidural during the first stage of labor once their cervix has dilated to around 4-5 centimeters – this is right before active labor typically begins. If you're eight or more centimeters dilated, it's likely that your care team won't have enough time to place the epidural.
Most of the time, you can walk within a half hour or so of your epidural injection. However, you will not necessarily be walking normally at this point. Most clinics and hospitals monitor you for 15 minutes to an hour after an epidural injection. During this time, they will likely ask how you feel.
The active phase
Your cervix is also dilated around 4 to 7 centimeters. Someone who has never given birth before may be in active labor for around three to six hours; a person who's done it before might take one to three hours.
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.
Does it hurt when my waters break? No, it shouldn't hurt when your waters break or when they are broken for you. The amniotic sac, which is the part that 'breaks' doesn't have pain receptors, which are the things that cause you to feel pain.
Does it hurt when your doctor artificially ruptures your membranes? Most people don't feel anything, especially if you are already in labor or got an epidural to manage painful contractions. Your baby also doesn't feel an amniotomy, and it doesn't hurt them in any way.
It does not hurt when your water breaks, but this procedure can be a little uncomfortable; you might feel a tug, followed by a warm trickle or gush of water.