Welcome to Moments with MamasteFit! In this new podcast series, we will be discussing one case study every week from our professional experience as a labor nurse and birth doula. In this episode, Gina and Roxanne discuss the concept of the labor curve and share diverse experiences on dilation rates during labor. They compare the historical Freedman’s Curve to contemporary understandings, emphasizing that dilation can be irregular and is just one part of assessing labor progress. They also highlight other important indicators such as temperament, movement patterns, and specific fetal heart rate changes, providing invaluable insights for both expecting individuals and birth supporters.
What is the Labor Curve?
The labor curve is a model used to predict how quickly someone should progress in labor, particularly how fast the cervix dilates. There are two main labor curve models:
1. Freedman’s Curve (1950s Model)
Developed in the 1950s, this model suggests that:
- Active labor starts at 3 cm dilation.
- Dilation should progress at a predictable rate:
- 1.2 cm per hour for first-time parents
- 1.5 cm per hour for those who have given birth before
- If dilation does not follow this timeline, medical interventions (such as Pitocin or breaking the water) are often recommended.
This model was widely accepted in hospitals for decades and is still referenced today, despite being outdated.
2. The Contemporary Labor Curve (Modern Model)
Recent research has challenged Freedman’s model, showing that labor actually progresses in a much more variable way:
- Active labor begins at 6 cm dilation, not 3 cm.
- Labor does not always follow a steady timeline—some people dilate quickly, while others take much longer.
- Labor should be assessed based on contraction patterns, temperament changes, and movement, rather than just dilation.
This shift in understanding means we should not rely solely on dilation to predict birth timing.
Real Birth Stories: The Unpredictable Nature of Labor
Story 1: From 4 cm to Baby in 30 Minutes!
Gina shares an incredible birth story where her client was 4 cm dilated at 10:00 AM, and by 10:30 AM, she was pushing and delivering her baby!
🔹 The client had a dramatic shift in labor temperament, moving into an active labor pattern quickly.
🔹 She suddenly felt intense pressure and the urge to push.
🔹 Within two pushes, the baby was born!
This rapid progression challenges the idea that labor must follow a slow and steady dilation pattern. Instead, it shows how labor can accelerate unexpectedly.
Story 2: One Centimeter Every Four Hours
On the other hand, Roxanne shares a birth story where her client dilated much more slowly:
🔹 She progressed one centimeter every four hours—a far cry from the “one cm per hour” rule.
🔹 Despite the slow progression, there was nothing wrong with her labor—it was simply her body’s natural rhythm.
This highlights how every labor curve is different, and slow progress does not necessarily mean something is wrong.
Dilation is Just a Moment in Time
One of the biggest takeaways from these stories is that dilation is not a reliable indicator of how much labor is left.
Someone can be:
✅ 6 cm for days without active labor.
✅ 4 cm and deliver within minutes.
✅ 9 cm for hours before pushing.
This is why other labor signs should be used to assess progress, rather than just dilation numbers.
What to Look for Instead of Dilation
1. Temperament Changes
One of the best signs of active labor is a shift in demeanor:
- Early labor: Chatty, able to engage in conversations between contractions.
- Active labor: More inward-focused, needing extra support, possibly vocalizing through contractions.
- Transition: Deep concentration, less interaction, and strong urges to push.
Gina emphasizes that if a laboring person suddenly stops engaging and becomes fully immersed in contractions, they are likely in active labor—regardless of dilation.
2. Movement Patterns
Movement patterns can also indicate labor progress:
- Mini squats and shifting deeply into the hips often mean baby is descending.
- Tippy-toe movements and swaying can signal that baby is pressing down into the pelvis.
- Sudden urge to “poop” is often a sign that pushing is near.
These physical cues are often more reliable than dilation checks.
3. Contraction Patterns
Rather than focusing on dilation alone, look at contraction frequency and intensity:
- Early labor: Contractions are irregular and mild.
- Active labor: Contractions are stronger, closer together, and require focus.
- Transition: Contractions are long, intense, and leave little time for rest.
If someone is having strong contractions but is only 2 cm dilated, they may still be in active labor based on their behavior and movement.
How Does This Apply to Epidurals?
For those with an epidural, movement and temperament changes may not be as obvious. Instead, nurses and doulas look for:
✅ Increasing pelvic pressure – A sign that baby is descending.
✅ Early decelerations on the fetal monitor – A normal heart rate change as the baby’s head is squeezed.
✅ Disappearing baby on the monitor – When the baby drops so low that the monitor can’t pick up the heartbeat properly.
These clues help care providers determine when labor is progressing, even when the laboring person can’t feel contractions strongly.
Key Takeaways: Trust Your Labor Curve
✅ There is no “normal” labor curve. Every birth is different, and the one-centimeter-per-hour rule is outdated.
✅ Dilation is just a snapshot. Someone can be stuck at a dilation for hours or dilate in minutes—and both can be normal.
✅ Look at the big picture. Temperament, movement, and contraction patterns are often better indicators of labor progress.
✅ Slow labor isn’t bad labor. Some people take longer, and that’s okay! The goal is a safe, supported labor experience.
By understanding that labor is unique for every person, we can reduce unnecessary interventions, lower stress, and create more positive birth experiences.
Want More Support?
If you want to feel strong, prepared, and confident for labor, check out MamasteFit’s resources:
🔹 Prenatal Fitness Programs – Strengthen your body for labor and delivery.
🔹 Childbirth Education Course – Learn about the labor process, coping techniques, and how to advocate for yourself.
🔹 Postpartum Recovery Programs – Rebuild your core and pelvic floor after birth.
🎉 Use code MOMENTS10 for 10% off any online offering!