Labor, Birth & Postpartum
Labor Induction: Why It's Done, Methods and What to Expect
Labor induction means using medicine or devices to start contractions before labor begins on its own. It's common, and it's done when giving birth now is safer than waiting: the pregnancy has gone past the due date, the water broke without contractions, or there's a health concern for you or the baby. An induction can take anywhere from several hours to more than a day.
The thing people most wish they'd known? It's often slow. Many picture walking in at 8 a.m. and holding a baby by dinner. For a first baby with a closed cervix, the more realistic picture is a day or two on the labor floor, much of it waiting.
Why would you be induced?
Medical reasons your provider may bring up:
- Going past your due date. ACOG says induction can be considered between 41 weeks 0 days and 42 weeks 0 days and is recommended after 42 weeks, because risks for the baby rise late in pregnancy.
- Your water broke but labor hasn't started (prelabor rupture of membranes). Infection risk climbs the longer this goes on.
- High blood pressure disorders, like gestational hypertension or preeclampsia.
- Diabetes that started before or during pregnancy.
- Concerns about the baby's growth or amniotic fluid levels.
- Infection in the uterus.
- Certain chronic health conditions.
Choosing induction at 39 weeks
You can also choose induction without a medical reason. After a large U.S. study called the ARRIVE trial, ACOG said it's reasonable to offer induction at 39 weeks to healthy first-time parents with low-risk pregnancies. In that trial, 39-week induction didn't raise the cesarean rate and was linked with lower rates of high blood pressure in pregnancy.
Induction before 39 weeks without a medical reason isn't recommended, because babies born earlier have higher risks of breathing and feeding problems.
It's a choice, not a requirement. Some people like having a date (especially if they're coordinating childcare or a long drive from Suffolk or upstate). Others would rather wait. Hospital scheduling varies, and busy NYC labor floors sometimes move scheduled inductions by a few hours or a day, so ask how that works where you'll deliver.
How it's done: two stages
First your provider checks how ready your cervix is, often using a Bishop score: how open, thin, soft and forward the cervix is, and how low the baby's head sits. A low score means the cervix needs "ripening" first.
Stage 1: ripening the cervix
| Method | What it's like |
|---|---|
| Prostaglandin medicine (misoprostol or dinoprostone) | A small pill or insert placed in the vagina, or a pill by mouth. Doses are often repeated every few hours. It can cause cramping and sometimes starts contractions on its own. |
| Balloon catheter (Foley or double balloon) | A thin tube is passed through the cervix and a small balloon is filled with fluid. Placement is uncomfortable for a minute or two, like a tough Pap. Then it's mostly pressure. It often falls out when you reach about 3 to 4 cm, which is a good sign. |
| Membrane sweep | Done in the office near term. Your provider runs a gloved finger around the cervix. It may help labor start sooner and can cause cramping and spotting afterward. |
These methods are sometimes combined.
Stage 2: getting contractions going
- Oxytocin (Pitocin). A synthetic version of the hormone your body makes in labor, given through an IV pump. The dose is raised gradually until contractions are regular.
- Breaking the water (amniotomy). A small plastic hook opens the amniotic sac. It doesn't hurt more than a cervical exam. It's done only when the cervix is open enough and the baby's head is well positioned. Afterward, you'll feel warm fluid leak with each contraction, which is normal.
Induction day, in order
- Arrival. You check in to labor and delivery, often at a scheduled time. Many hospitals call that morning to confirm they have a bed.
- Setup. Gown, IV, bloodwork, and monitors on your belly for the baby's heart rate and your contractions. Monitoring is often continuous once medicines start.
- Ripening. Several doses of medicine or a balloon. This is the long part. Depending on the method, you may be able to walk, rest or shower. Sleep if you can.
- Active labor. Once contractions are regular and your cervix opens further, labor goes on much like spontaneous labor.
- Pain relief. You can usually get an epidural or other pain relief during induction. See labor pain relief options.
Some hospitals offer outpatient ripening with a balloon: it's placed, you go home overnight, and you come back. Whether that's possible depends on your health and the hospital.
What to pack for an induction
- Phone charger with a long cord
- Snacks and real food for your support person (the cafeteria may be closed at 2 a.m.)
- Your own pillow, a robe and slippers
- Something to pass slow hours: downloaded shows, a book, cards
- A copy of your birth plan, with your induction preferences
How long does induction take?
The two biggest factors are how ready your cervix is at the start and whether you've had a vaginal birth before.
| Starting point | What usually happens first | General pace |
|---|---|---|
| Cervix closed and firm | Ripening with medicine and/or balloon | Slower; can take a day or longer |
| Cervix partly open and soft | Oxytocin and/or breaking the water | Faster; often hours |
| Prior vaginal birth | Either, depending on cervix | Usually faster than a first birth |
A slow start doesn't mean the induction is failing. It's normal for ripening alone to take many hours.
Risks of induction
Induction is generally safe, but there are downsides to know about:
- Contractions that are too strong or too close together, which can affect the baby's heart rate. The team can lower or stop the medicine and give treatment.
- Infection, especially when the water has been broken for a long time.
- Failed induction, leading to a cesarean birth.
- Uterine rupture, rare but serious, and more likely if you've had a prior cesarean or uterine surgery. Some methods, such as misoprostol, aren't used after a prior cesarean.
- Heavier bleeding after birth, which is more common after long labors with oxytocin.
Questions to ask your provider
- Why are you recommending induction, and what happens if I wait?
- How ready is my cervix? What method will you start with?
- Can I eat, walk around or shower during ripening?
- Is outpatient ripening an option for me?
- At what point would you recommend a cesarean?
When to call your provider
Before a scheduled induction, call your provider or labor and delivery right away if:
- Your water breaks, or you think it has
- You have bleeding heavier than spotting
- Your baby is moving less than usual
- You have a severe headache, vision changes, or swelling in your face or hands
- You have strong, regular contractions before your induction date
If you have a condition like preeclampsia or diabetes, you may also be seeing a maternal-fetal medicine specialist. To find an OB/GYN or midwife near you, search the directory.
Frequently asked questions
How long does labor induction take?
It varies a lot. If your cervix is already soft and open, labor may start within hours. If it's closed and firm, cervical ripening alone can take a day or longer before active labor begins, especially in a first pregnancy.
Is induction at 39 weeks safe?
For healthy people with low-risk pregnancies, ACOG says offering induction at 39 weeks is a reasonable option. A large trial found it didn't increase cesarean births in first-time mothers. Talk with your provider about whether it fits your situation.
Is induced labor more painful?
Some people find induced contractions come on stronger or faster than natural labor, especially with oxytocin. Pain relief options, including an epidural, are usually available during an induction.
What happens if the induction does not work?
If labor doesn't progress after enough time with medicine and broken waters, or if there are concerns for you or the baby, your provider may recommend a cesarean birth. Sometimes an induction can be paused and restarted if everyone is healthy.
Sources
- ACOG — Labor Induction (Patient FAQ)
- ACOG — Induction of Labor (Practice Bulletin 107)
- ACOG — Clinical Guidance for Integration of the Findings of the ARRIVE Trial (Practice Advisory)
- ACOG — Management of Late-Term and Postterm Pregnancies (Practice Bulletin 146)
This article is for general education and is not medical advice. It does not replace an evaluation by a licensed clinician who knows your history. If you think you have a medical emergency, call 911.