Stage one
Labor: contractions and cervical dilation
Early labor · active labor · transition
The first stage begins with regular contractions and ends when the cervix is fully effaced (thinned) and dilated to 10 centimetres. It is the longest of the three stages and is divided into early labor, active labor and transition.
How long it lasts: Often 12–19 hours in a first birth; frequently shorter if you have given birth before.
Early labor (latent phase)+
The cervix softens, shortens and opens to about 6 cm. You may pass the mucus plug — a clear, pink or slightly bloody discharge.
Contractions — Mild to moderate, often irregular. Commonly around 5–20 minutes apart in this phase.
Typical length — Unpredictable — hours to days, and it can stop and start.
- Most people with a low-risk pregnancy spend early labor at home.
- Rest and sleep if you can; eat and drink normally unless told otherwise.
- Walking, a warm shower, position changes and calm surroundings help.
- Braxton Hicks contractions are irregular practice contractions — they do not build a pattern.
Active labor+
The cervix opens from about 6 cm to 10 cm. This is the point at which you should be at your hospital or birth centre.
Contractions — Stronger, longer and more consistent — typically around 3–5 minutes apart and building.
Typical length — Often 4–8 hours or more; on average the cervix opens about 1 cm per hour.
- Your water may break now if it has not already.
- Back and thigh pressure, leg cramps and nausea are common.
- Pain relief — from breathing and movement to an epidural — is your choice to make and can be asked for at any time.
- Only you can judge your need for pain relief.
Transition+
The last part of the first stage, as the cervix finishes opening to 10 cm. Many people describe it as the most intense stretch.
Contractions — Close together, lasting roughly 60–90 seconds.
Typical length — Typically short — about 15–60 minutes.
- Strong pressure in the lower back and rectum is common.
- Tell your care team as soon as you feel an urge to push.
- If the cervix is not fully open, panting or blowing through contractions is usually advised rather than pushing.
What Stages of Labor does in stage one. This is where a contraction timer earns its place. One tap starts a contraction, one tap stops it. The app keeps every length, the interval measured start to start, and rolling averages — so when someone asks 'how far apart are they?' the answer is already on the screen. You can also store the exact rule your own provider gave you (many are shaped like 5-1-1) and the app will repeat their words back to you when the pattern you recorded holds.