The Cervix (also called the neck of the uterus) is the lower part of the uterus that opens into the vagina. As labour nears, the baby's head drops down into the pelvis and pushes against the cervix, which begins to thin (efface) and open (dilate) to allow the baby into the birth canal. In some women, this process is a gradual one, taking over a few days or weeks (especially for first-time moms), while in others it could be a rapid one.

When the expected date of delivery draws near, your doctor may perform an internal examination to check how far your cervix has dilated. The opening of the cervix (dilation) is measured in centimeters, while the thinning of the cervix (effacement) is usually measured in percentage.

Cervical Dilation and Labour
When the cervix dilates from zero to 4 centimeters, this phase is known as the latent phase of labour. During this stage, you may feel mild to moderately strong contractions. You may notice a thick, stringy, blood-tinged discharge from your vagina as the cervix begins to open. This is known as a bloody show. You may also experience a backache, upset stomach and, possibly, diarrhea. Some women report a sensation of warmth in the abdomen as labor begins.

To ease the anxiety, you could take a shower, listen to relaxing music or try slow, deep breathing exercises.

When the cervix has dilated 4 to 5 centimeters, a woman is considered to be in active labor, and faster dilation of the cervix happens for each hour of contractions.

The cervix will continue to dilate to 10 centimeters (maximum). You may start to feel more pelvic pressure and may even feel the urge to push as the baby moves lower into the pelvis. If you aren't fully dilated, it's important that you resist the urge to push, because in some instances the cervix could tear.

This phase of labor also includes the transition phase, which typically begins when the cervix is 7 or 8 centimeters dilated and continues until 10 centimeters. When your cervix has dilated completely, it is time for the real action to begin - when you can begin to bear down and push out your little miracle.

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