Induction is the process of starting labor artificially rather than waiting for it to begin on its own. It involves medications, physical devices, or both to trigger contractions and open the cervix so delivery can happen vaginally. About 1 in 4 pregnancies in the United States involves some form of induction, either for medical reasons or by choice.
Why Labor Is Induced
Induction is most often recommended when continuing the pregnancy poses more risk than delivering the baby now. Common medical reasons include preeclampsia or chronic high blood pressure, gestational diabetes, poor fetal growth, low amniotic fluid, an infection in the uterus, or water breaking without contractions starting on their own (known as prelabor rupture of membranes).
Timing also plays a role. Induction should be considered after 41 weeks and is recommended after 42 weeks, since the placenta becomes less efficient at supporting the baby as pregnancy extends past its due date. In some cases, induction is offered at 39 weeks even without a medical complication. A large clinical trial called ARRIVE found that healthy first-time mothers induced at 39 weeks had a lower cesarean delivery rate (18.6%) compared to those who waited for labor to start naturally (22.2%), and their infants were less likely to need breathing support in the first few days of life.
How Your Doctor Assesses Readiness
Before induction begins, your provider checks whether your cervix is ready for labor using a scoring system called the Bishop Score. It evaluates five things: how dilated (open) your cervix is, how thin it has become, how soft it feels, its position relative to the birth canal, and how far down the baby’s head has descended into the pelvis. Each factor receives a point value that adds up to a total score.
A score of 8 or higher means your body is close to labor and induction is very likely to succeed. A score of 6 or 7 is borderline. Five or below means your cervix isn’t ready yet, so induction will need to start with a step called cervical ripening before contractions can be triggered. This extra step is common, especially for first-time mothers.
Cervical Ripening: The First Step
If your cervix is still firm and closed, your care team will use medications or a physical device to soften and open it before moving on to stronger contraction-inducing drugs.
One common approach is a balloon catheter. A thin tube with a small inflatable balloon is placed through the cervix. Once inflated, it applies gentle, steady pressure that gradually widens the opening. The catheter is removed after about 12 hours, or it falls out on its own once the cervix has dilated enough. This method is simple, well tolerated, and sometimes even done in the clinic before you’re admitted to the hospital.
Medication-based ripening uses a type of hormone called prostaglandin, placed in or near the cervix. These drugs mimic the natural chemicals your body produces to soften cervical tissue. They come as a gel or a small insert. Side effects can include nausea, diarrhea, or a mild fever. Your provider may combine a balloon catheter with medication to shorten the overall process.
Starting Contractions
Once the cervix is ready, the next goal is establishing regular, effective contractions. The most common way to do this is with a synthetic version of oxytocin, the hormone your body naturally releases during labor. It’s given through an IV, starting at a very low dose and increased gradually every 30 to 60 minutes until contractions settle into a steady pattern. An infusion pump controls the rate precisely, and your nurse adjusts it throughout labor. Once you reach about 5 to 6 centimeters of dilation and labor is progressing well, the dose can often be lowered.
Another tool your provider may use is amniotomy, which means breaking the amniotic sac (your “water”) with a small hook-like instrument. Releasing the fluid allows the baby’s head to press more directly on the cervix, which stimulates stronger contractions and faster dilation. Amniotomy is typically done once the baby’s head is low in the pelvis and the cervix has already started to open. Afterward, contractions often become noticeably more intense and closer together.
How Long Induction Takes
Induction is almost always longer than spontaneous labor, and the timeline varies widely depending on how ready your cervix was at the start. If cervical ripening is needed, that alone can take 12 hours or more before active contractions even begin.
Once active labor kicks in, first-time mothers who were induced take a median of about 5.5 hours to go from 4 centimeters to full dilation, compared to roughly 3.8 hours for those whose labor started naturally. At the slower end, that stretch can last nearly 17 hours. For mothers who have given birth before, the process tends to move faster. It’s common for an induction that begins in the evening to result in delivery the following day, or even the day after that.
Risks to Be Aware Of
The primary concern during induction is overstimulation of the uterus, a condition called tachysystole, where contractions come six or more times in a 10-minute window. This rapid pace is significantly associated with dips in the baby’s heart rate, which is why continuous fetal monitoring is standard during induction. If contractions become too frequent, your care team can lower or pause the oxytocin drip, and in many cases the pattern corrects quickly.
Induction also carries a somewhat higher chance of needing a cesarean delivery compared to labor that starts spontaneously at the same gestational age, particularly when the cervix is very unfavorable at the start. That said, the ARRIVE trial showed that elective induction at 39 weeks for low-risk first-time mothers actually reduced the cesarean rate compared to waiting, so the relationship between induction and cesarean risk depends heavily on context and timing.
Other potential complications include infection (especially after the membranes have been ruptured for an extended time), heavier postpartum bleeding, and, rarely, problems with the umbilical cord slipping into the birth canal after amniotomy. Your medical team monitors for all of these throughout the process.
What the Experience Feels Like
For most people, the early hours of induction involve a lot of waiting. Cervical ripening can feel like mild menstrual cramps or cause no discomfort at all. Once oxytocin is started or increased, contractions build steadily and can feel more intense than early spontaneous labor because the body is being pushed into active labor rather than easing into it gradually. Pain management options, including epidurals, are available at any point during induction and are used at similar rates as in spontaneous labor.
You’ll be connected to a fetal heart rate monitor and an IV line, which limits your ability to move freely. Some hospitals offer wireless monitors that let you walk, change positions, or use a birthing ball. Eating policies vary by hospital, but you’ll typically be allowed clear liquids. The combination of a long timeline, limited mobility, and intensifying contractions can be physically and emotionally draining, so having a support person with you makes a real difference.