Inducing labor is a multi-step process that uses medications, mechanical devices, or both to start contractions and open the cervix when labor hasn’t begun on its own. The process can take anywhere from several hours to two or three days depending on how ready your body is when induction starts. Understanding each step helps you know what to expect and why your care team may use different methods at different stages.
Why Labor Is Induced
Induction is recommended when continuing the pregnancy poses more risk than delivering the baby. The most common reasons include preeclampsia or chronic high blood pressure, gestational diabetes, an infection in the uterus, low amniotic fluid, and poor fetal growth. If your water breaks but contractions don’t start on their own (called prelabor rupture of membranes), induction is also standard practice.
Sometimes induction is offered at 39 weeks even without complications, based on evidence that it can reduce the chance of a cesarean in certain groups. Your provider will weigh your specific situation, including how favorable your cervix looks, before recommending a timeline.
How Your Cervix Is Assessed First
Before induction begins, your provider checks whether your cervix is ready for labor using a scoring system called the Bishop score. This assessment looks at five things: how dilated your cervix is, how thin it has become (effacement), how soft it feels, its position, and how far the baby’s head has descended into the pelvis. Each factor is scored on a scale of 0 to 2 or 3 points, and the numbers are added together.
A higher Bishop score means your cervix is already showing signs of labor readiness, which generally predicts a faster, more straightforward induction. A low score, meaning the cervix is still firm, closed, and positioned far back, signals that your body needs extra help before contractions can do their job. That’s where cervical ripening comes in.
Step One: Softening and Opening the Cervix
If your cervix isn’t ready, the first phase of induction focuses on ripening it. This can be done with medication, a mechanical device, or both at the same time.
Prostaglandin Medications
Prostaglandins are hormone-like substances that break down the tough connective tissue in the cervix, making it softer and more elastic. They boost the activity of enzymes that dissolve collagen fibers, relax the smooth muscle in the cervix to help it open, and eventually trigger mild uterine contractions. These medications are placed directly in or near the cervix as a gel, insert, or small tablet. A synthetic version of one prostaglandin is widely used because it’s effective and inexpensive. The medication works gradually over several hours, and you may need more than one dose.
The Foley Balloon
A Foley balloon is a simple, drug-free option. Your provider threads a thin, flexible catheter through your vagina and into the opening of the cervix, then inflates a small balloon at the tip with about 2 ounces of saline solution. The balloon puts steady, gentle pressure on the cervix from the inside, encouraging it to dilate. Once the cervix opens enough (usually around 3 centimeters), the balloon falls out on its own. Many providers use the Foley balloon alongside prostaglandin medication to speed up the ripening process.
Cervical ripening is often the longest part of induction. It can take 12 to 24 hours or more, and in some cases, providers repeat treatments over two or three days before active labor kicks in.
Step Two: Starting Contractions
Once your cervix is soft and partially open, the goal shifts to establishing regular, strong contractions. The primary tool here is synthetic oxytocin, delivered through an IV. Your body naturally produces oxytocin during labor to make the uterus contract. The synthetic version works the same way: it binds to receptors in the uterine muscle and triggers contractions. Those contractions then signal your brain to release even more natural oxytocin, creating a feedback loop that increases both the strength and frequency of contractions over time. Oxytocin also stimulates your body’s own prostaglandin production, which further moves labor along.
Your provider starts the IV at a low rate and increases it gradually, usually every 15 to 30 minutes, until contractions are coming regularly and strong enough to dilate the cervix. The dose can be turned down or paused if contractions become too frequent. The medical threshold for concern is six or more contractions in a 10-minute window, which can reduce blood flow to the baby. Continuous fetal monitoring is standard during oxytocin administration so your care team can catch this quickly and adjust.
Breaking the Water
Another tool in the induction process is amniotomy, the deliberate rupture of the amniotic sac. Your provider uses a thin plastic hook, roughly 12 inches long with a curved tip, inserted through the vagina to scratch a small hole in the membrane. The fluid drains out, and this allows the baby’s head to press directly against the cervix, which stimulates stronger contractions. Rupturing the membranes also releases hormones that intensify labor.
Amniotomy is usually done after the cervix has already dilated a few centimeters. It’s often combined with oxytocin rather than used alone, and it can noticeably speed up the labor process once things are underway. The procedure itself is brief and feels similar to a cervical exam, though the gush of warm fluid afterward is unmistakable.
What Induced Labor Feels Like
Contractions during an induced labor tend to be more frequent and more intense than those in labor that starts spontaneously. In natural labor, contractions typically build gradually over hours, giving your body time to adjust. With induction, especially once oxytocin is running, contractions can ramp up faster and feel stronger earlier on. Research shows that people undergoing induction request epidurals sooner than those in spontaneous labor. For first-time mothers, that gap is a few hours earlier on average. For those who have given birth before, the difference is more dramatic, with induced patients requesting epidurals roughly half as many hours into the process.
The intensity of early induced labor can be significant. In one study, some participants found it difficult to even complete pain questionnaires between contractions during the early phase of induction, suggesting the discomfort was already consuming their focus. Epidural use is also higher overall in the induced group, particularly among people who have given birth before. All standard pain management options, including epidurals, nitrous oxide, and IV pain medication, are available during induction.
How Long the Whole Process Takes
The total timeline varies widely. If your cervix is already favorable when induction starts, you could be holding your baby within 8 to 12 hours. If your cervix needs extensive ripening first, the process from the first intervention to delivery can stretch to 24 to 48 hours or occasionally longer. The NHS advises patients not to worry if it takes two or three days for labor to truly get going after induction begins.
Most of that waiting happens during cervical ripening, which can feel frustratingly slow. Once active labor is established with regular, strong contractions, the remaining timeline is more similar to spontaneous labor. First-time mothers typically have a longer active labor than those who have delivered before, regardless of whether labor was induced.
What Happens if Induction Doesn’t Work
Not every induction leads to vaginal delivery. A “failed induction” generally means the cervix hasn’t dilated adequately despite prolonged efforts, or the baby isn’t tolerating the process well. At a large academic center tracked over nearly a decade, the rate of first-time cesarean deliveries specifically due to failed induction held steady at about 4.5 to 4.8 percent. That number is reassuringly low, though individual risk depends on factors like your Bishop score at the start, the reason for induction, and whether this is your first baby.
If your provider determines the induction isn’t progressing, a cesarean delivery is the next step. In some cases, the team may try a different approach first, such as switching from one ripening agent to another or adding amniotomy, before making that call. The definition of “failed” has also evolved over the years, with more providers now allowing longer windows before concluding that induction has not succeeded.
Risks to Be Aware Of
The main risks of induction relate to overstimulation of the uterus. When contractions come too close together, the uterus doesn’t fully relax between them, which can temporarily reduce oxygen flow to the baby. This is why continuous fetal monitoring is used throughout the process. If the baby’s heart rate pattern shows signs of distress, the oxytocin drip can be lowered or stopped, and in most cases the situation resolves quickly.
Induction also carries a slightly higher chance of needing assisted delivery with vacuum or forceps, and a higher likelihood of needing an epidural due to the intensity of contractions. The risk of uterine rupture exists but is primarily a concern for people who have a scar from a previous cesarean. For most people being induced for the first time without prior uterine surgery, the procedure is considered safe when performed in a hospital with continuous monitoring.