The induction process is a medical procedure that starts labor artificially rather than waiting for it to begin on its own. It involves softening and opening the cervix, then stimulating contractions using medication or physical techniques. For most people, the entire process takes anywhere from several hours to more than 24 hours, depending on how ready the body is when induction begins.
Why Labor Is Induced
Induction is recommended when continuing a pregnancy poses more risk to the mother, the baby, or both than delivery does. The most common reasons include high blood pressure disorders like preeclampsia, gestational or preexisting diabetes, low amniotic fluid, restricted fetal growth, and pregnancies that extend past 41 weeks.
The timing depends on the specific condition. Well-controlled gestational diabetes managed through diet or exercise, for example, typically leads to induction between 39 and 40 weeks. Preeclampsia without severe features triggers induction at 37 weeks. Preeclampsia with severe features moves the timeline up to 34 weeks. If the water breaks prematurely before 37 weeks, induction is generally recommended at 34 weeks or at the time it happens if that’s later. Other urgent situations, such as placental abruption, infection of the amniotic sac, or fetal demise, call for induction as soon as the diagnosis is made.
How Your Cervix Is Assessed First
Before induction begins, your provider checks your cervix using a scoring system called the Bishop score. This evaluation looks at five things: how dilated (open) the cervix is, how thin it has become (effacement), how soft it feels, its position relative to the birth canal, and how far the baby’s head has descended into the pelvis. Each factor gets a point value, with the total ranging from 0 to 13.
A score of 8 or higher generally means the cervix is already favorable for induction and labor is likely to progress well. A lower score means the cervix needs preparation first, a step called cervical ripening. The California Maternal Quality Collaborative recommends ripening until the score reaches at least 6 for people who have given birth before, or 8 for first-time mothers. This distinction matters because a cervix that isn’t ready can make the entire process significantly longer.
Cervical Ripening: The First Step
If your cervix isn’t ready, your care team will use one of two approaches to soften and thin it: medication or a mechanical device.
The medication route uses prostaglandins, hormones that naturally help prepare the cervix. One common option is a vaginal insert that slowly releases medication over 12 hours. Another is a small tablet placed vaginally every 3 to 6 hours. Both work by gradually softening cervical tissue and can sometimes trigger contractions on their own.
The mechanical approach uses a small balloon catheter threaded through the cervix. Once inflated, the balloon applies gentle, steady pressure that encourages the cervix to dilate. This method is particularly useful for people who have had a previous cesarean birth, since it carries a lower risk of overstimulating the uterus. Some providers combine a balloon catheter with prostaglandins to speed things up.
Cervical ripening is often the longest part of induction. It can take 12 hours or more before the cervix is ready for the next phase.
Stimulating Contractions
Once the cervix is favorable, the next step is getting regular, effective contractions going. This is done with a synthetic version of oxytocin, the hormone your body naturally produces during labor, delivered through an IV.
The infusion starts at a very low rate, typically 1 to 2 milliunits per minute, and is gradually increased every 15 to 30 minutes until contractions are coming regularly, about three every ten minutes. Your provider monitors both the contraction pattern and the baby’s heart rate continuously to guide these adjustments. The goal is strong, consistent contractions that dilate the cervix without overwhelming the uterus.
Breaking the Water
At some point during induction, your provider may also perform an amniotomy, the artificial rupture of the amniotic sac. This is done using a small hook-like instrument during a vaginal exam. It’s quick and feels similar to a cervical check, followed by a gush of warm fluid.
Amniotomy can help speed up labor by allowing the baby’s head to press more directly on the cervix. However, it’s only performed once the baby’s head is well engaged in the pelvis. If the head is too high, there’s a risk of the umbilical cord slipping down ahead of it, a rare but serious complication called cord prolapse. Breaking the water also removes the barrier between the baby and vaginal bacteria, so if labor stalls afterward, the risk of infection increases over time.
How Long the Whole Process Takes
The total time from the start of induction to delivery varies widely. The early phase of labor alone, when contractions are building and the cervix is opening, can take up to 24 hours or longer. ACOG recommends that people induced at 39 weeks be allowed at least that much time for the early phase before the induction is considered unsuccessful. After amniotomy, oxytocin should run for at least 12 to 18 hours before a decision is made about changing course.
First-time mothers tend to have longer inductions than those who have given birth before. Starting with an unfavorable cervix also adds hours. In total, some inductions wrap up in under 12 hours, while others stretch past 24 or even 36 hours. This unpredictability is one of the most common frustrations people report, so it helps to set realistic expectations early.
Risks to Be Aware Of
The most closely watched complication during induction is uterine tachysystole, defined as more than five contractions in a 10-minute window averaged over 30 minutes. Studies of induced labor show tachysystole rates between 30% and 43%, depending on the medications used. When contractions come too fast, the uterus doesn’t fully relax between them, which can reduce blood flow to the baby and cause concerning changes in heart rate. If this happens, your care team will lower or pause the oxytocin, reposition you, or take other steps to give the uterus time to recover.
Other risks include infection (especially after the water has been broken for an extended period), a longer labor overall compared to spontaneous onset, and a somewhat higher chance of cesarean delivery for first-time mothers with an unfavorable cervix at the start. That said, large studies have shown that elective induction at 39 weeks in low-risk pregnancies does not increase cesarean rates and may actually lower them slightly compared to waiting for labor to start on its own.
What the Experience Feels Like
During cervical ripening, you may feel mild cramping or period-like discomfort. Some people barely notice it, while others find it quite uncomfortable, especially overnight. Once oxytocin is running and contractions pick up, the sensation is similar to spontaneous labor: tightening waves that build in intensity. Many people find that induced contractions ramp up faster and feel more intense sooner than they expected, partly because there isn’t the gradual warm-up that often happens with natural labor.
Pain relief options remain the same as in spontaneous labor. Epidurals are available and commonly requested during induction, especially since the process can be long. You’ll have continuous fetal monitoring throughout, which means belts around your abdomen and limited (though not necessarily zero) ability to move around. Some hospitals offer wireless monitors that allow more freedom.