Induction of Labour: Why, How and What to Expect

✓ This content has been medically reviewed by an obstetrician and gynaecologist
Written & medically reviewed by: Op. Dr. Ayşet Jane Özcan, Obstetrics & Gynaecology Specialist
Istanbul Faculty of Medicine · Medical Park Bahçelievler · TJOD and TSRM member
Last updated: 15 October 2026 · Last medical review: 15 October 2026

If your doctor or midwife has suggested bringing your labour on, you probably have two questions at the same time: why now, and what is actually going to happen to me. Induction of labour — written induction of labor in American English — is one of the most common things done in a maternity unit, and one of the least well explained. Many women arrive knowing only that they are being "started off", with no clear picture of how many stages there are, how long they may be in hospital, or what they are allowed to ask for.

This guide goes through it in the order you will live it: what induction means, why it is offered, how your cervix is assessed first, each method from a membrane sweep to the hormone drip, how long the whole thing tends to take and why it can be slow, whether it hurts more, what can go wrong, what happens if it does not work, and what your choices are at every point. Nothing here replaces the conversation with the team looking after you — but it should mean you walk into that conversation already knowing which questions matter.

What induction of labour actually means

Induction of labour means starting labour artificially, with medication or a mechanical device, rather than waiting for it to begin by itself. It is offered when the balance tips — when continuing the pregnancy is judged to carry more risk for you or your baby than bringing the birth forward.

It helps to understand that your body normally does two separate jobs in order to go into labour. First the cervix, the neck of the womb, has to change: for most of pregnancy it is firm, long, closed and pointing backwards, and before labour it softens, shortens, moves forward and starts to open. Second, the uterus has to begin contracting in a strong, regular, co-ordinated pattern. An induction has to achieve both of these, usually in that order. That is the single most useful thing to know about it, because it explains why induction is a process spread over hours or days rather than one injection that sets everything off.

Induction is not the same thing as augmentation. Augmentation means labour has already started on its own and is being speeded up or strengthened, usually with a hormone drip. Induction means nothing has started yet. Some of the same medicines are used in both, which is why the two words get muddled.

Induction is also common, and becoming more so. In the UK and the US around one in three births now begins this way, with rates in other high-income countries ranging from roughly a fifth to a third. That does not make it a small thing for the woman going through it, but it does mean the pathway is well established and every midwife and obstetrician on the unit will have a clear plan for each stage.

Why induction is offered: the common reasons

Induction is offered when waiting is thought to carry more risk than being induced. A handful of situations account for most inductions, and in almost every case the underlying logic is the same: the pregnancy is no longer the safest place for the baby, or it is no longer safe for you.

Going past your due date. This is the commonest reason of all. The placenta is not designed to work indefinitely, and the small background risk of stillbirth starts to creep up from around 39 to 40 weeks and rises more steeply beyond 41 weeks, which is why most units offer induction between 41 and 42 weeks. The exact timing within that window depends on local policy and on your individual picture. A due date is a midpoint, not a deadline, and going a few days over is entirely normal.

Your waters have broken but labour has not started. Once the membranes are open, the barrier that protects the baby from bacteria is gone, and the risk of infection climbs the longer things are left. Most women start contracting on their own within about a day; if you have not, induction is usually offered. If you choose to wait, you will be asked to monitor your temperature, the colour and smell of the fluid, and your baby's movements. Our separate guide on how to tell your waters have broken and what to do next covers this in more detail.

High blood pressure and pre-eclampsia. Pre-eclampsia is a condition of the placenta, and the only definitive treatment is to deliver the baby and placenta. Medication can control your blood pressure and buy time, but it does not cure the condition. How soon birth is recommended depends on how severe the changes are, what your blood tests show and how many weeks pregnant you are. If you are not sure what to look out for, read about the warning signs of pre-eclampsia.

Concern about the baby's growth or wellbeing. If scans suggest the baby is small for dates, has stopped growing along their expected line, has reduced fluid around them, or has blood flow changes on Doppler studies, continuing the pregnancy may be more of a strain than delivering. Repeated episodes of reduced fetal movements can lead to the same discussion.

Diabetes in pregnancy. Whether the diabetes existed before pregnancy or appeared during it, placental function and the baby's size both come into the timing decision. Women whose blood sugars need medication, or whose babies are measuring large, are usually advised not to go much past their due date, and often earlier.

• Obstetric cholestasis (intense itching with abnormal liver or bile acid results)
• Twin pregnancy, where birth is usually planned rather than awaited
• A previous stillbirth or a previous very large baby
• Being over 40, which is treated in many units as a reason not to go far past the due date
• Other maternal medical conditions — kidney disease, heart conditions, poorly controlled thyroid disease
• Occasionally, induction on request after a full discussion of the pros and cons, where the pregnancy is otherwise straightforward and at term

Before the induction starts: the cervix check and the membrane sweep

Before anything is given, someone will examine your cervix internally — and what they find largely determines which method is used and how long the whole process is likely to take. This examination is the most informative part of the whole induction and it is worth asking what was found.

Five things are assessed: how soft the cervix is, how far forward it points, how short it has become, how open it is, and how low the baby's head is sitting. These are combined into a score, usually called the Bishop score. A favourable cervix is already soft, short and slightly open, and in that situation it may be possible to go straight to breaking the waters. An unfavourable cervix is firm, long, closed and pointing backwards, and it needs ripening first with medication or a balloon. Nothing about an unfavourable cervix means anything is wrong — first-time mothers simply tend to start further back.

At the same appointment the baby's heartbeat will be recorded on a CTG trace for around 20 to 30 minutes, you will be asked about movements, and your blood pressure and urine will be checked. A scan is sometimes done to confirm the baby's position, the amount of fluid and where the placenta lies. Induction is not usually offered for a baby lying bottom-down or sideways.

If you are still some days away from a formal induction, you may be offered a membrane sweep at a clinic appointment. This is not induction in the strict sense — it is an attempt to encourage labour to start on its own and reduce the chance of needing the full process. A gloved finger is passed through the cervix and swept in a circle to separate the membranes from the lower part of the womb, which releases local prostaglandins. It is uncomfortable rather than painful, usually takes under a minute, and can cause cramping and some spotting for a day afterwards. It can be repeated. If the cervix is still completely closed, only a gentler massage of the cervix is possible. There is more detail in our guide to what a membrane sweep involves and how it feels.

Ripening the cervix: prostaglandin and the balloon catheter

If your cervix is not yet favourable, the first stage of induction is to ripen it. There are two mainstream ways of doing this: a prostaglandin preparation placed in the vagina, or a balloon catheter placed through the cervix. Both work gradually over many hours, and neither is labour.

Vaginal prostaglandin. Prostaglandins are the same family of substances your body uses naturally to soften the cervix. They are given as a gel, a tablet, or a slow-release pessary on a small tape that can be removed. A slow-release pessary is usually left in place for up to 24 hours; a gel or tablet is normally repeated after about six hours if nothing has changed. You will be asked to lie down for around half an hour after it is inserted, and the baby's heartbeat is monitored before and for a period afterwards. Expect period-like cramping and irregular tightenings — these are the medicine working on the cervix, not necessarily labour starting. Some units use a low-dose oral prostaglandin tablet instead, on a similar repeating schedule.

Balloon catheter. A thin, soft tube is passed through the cervix and one or two small balloons are inflated with sterile water, so that gentle, steady pressure is applied from inside. It stays in for up to around 12 to 24 hours and usually falls out by itself once the cervix has opened to a few centimetres. Because no medication is involved, it cannot over-stimulate the uterus, which is why it is often the preferred option if you have had a caesarean before, or if there has already been some concern about the baby's heart rate pattern. Insertion feels like a smear test with a strong period cramp, and takes a few minutes.

Which method you are offered depends on your cervix, your history, and your unit's protocol. If you have a preference — for example to avoid prostaglandin, or to try a mechanical method first — say so, and ask whether it is available. Some units also offer outpatient ripening, where the pessary or balloon is placed and you go home for the night with clear instructions about when to come back or ring; this is not suitable for everyone, and depends on how far you live from the hospital and why you are being induced.

Breaking the waters and the oxytocin drip

Once the cervix has opened enough — often around two to three centimetres — and the baby's head is sitting well down, the next step is to break the waters. This is called an artificial rupture of membranes, or ARM.

It is done during a vaginal examination using a thin plastic hook, which makes a small opening in the membranes. There are no nerve endings in the membranes and the baby feels nothing; for you it feels like the examination itself, followed by a gush of warm fluid that keeps trickling afterwards. The colour of the fluid is noted, because clear or slightly pink fluid is normal, while green or brown fluid means the baby has passed meconium and the team will want closer monitoring.

Breaking the waters helps because it removes the cushion between the baby's head and the cervix, so the head presses down directly, which in turn releases more of your own prostaglandins. Contractions often strengthen noticeably within an hour or two. It also starts a clock: once the membranes are open, the infection risk means the plan is expected to keep moving forward rather than pausing for a day.

If contractions do not establish after the waters are broken, the final step is a drip containing synthetic oxytocin — a manufactured version of the hormone your body makes to drive contractions. It goes through a small cannula in the back of your hand and is started at a low rate, then increased every 30 minutes or so until you are contracting around three to four times in every ten minutes, each lasting about a minute. Because the drip controls the strength of your contractions, continuous monitoring of the baby's heartbeat is required while it runs, and the rate can be turned down or stopped at any time if contractions become too strong or the baby does not like them.

This is usually the point at which an induction becomes labour in the ordinary sense. From here, progress is checked by internal examination roughly every four hours, and the birth itself is no different from any other.

How long does an induction take, and why can it be so slow?

For a first baby with an unfavourable cervix, it is realistic to plan for one to three days from the first pessary to the birth. If this is your second or later baby, or if your cervix was already favourable, it can be very much quicker — sometimes a matter of hours. The honest answer to "how long" is that nobody can tell you at the start, and that the cervix examination gives the best clue.

The slow part is almost always the ripening stage. A slow-release pessary may be left for a full 24 hours before anyone reassesses; if the cervix has barely changed, a second cycle may be offered the following day. Each step has to be assessed before the next one is allowed, which is exactly as it should be, but it means long stretches of waiting in which nothing appears to be happening. Something is happening — the cervix is changing — it just cannot be felt.

There is also a non-clinical reason inductions stall. Breaking the waters and starting the oxytocin drip require a labour room and a midwife who can stay with you, and if the unit is full that step may be delayed by hours. This is frustrating, particularly if you have been fasting or awake all night, but it is not a sign that anything has gone wrong with you or your baby. It is reasonable to ask for a realistic estimate and to ask to be updated.

The practical consequence is that you should prepare for a hospital stay, not an appointment. Most of the early part is spent on an antenatal ward, where you can usually walk about, rest, eat according to your unit's policy and keep yourself occupied. Many women find the waiting harder than the labour, so going in with that expectation already set makes a real difference.

Does induction hurt more than labour that starts by itself?

For many women, yes — induced contractions feel more intense sooner, particularly once the oxytocin drip is running. That is worth saying plainly rather than glossing over, because being surprised by it is part of what makes it hard. The earlier stages, by contrast, usually feel like strong period pain rather than labour.

There are several reasons for the difference. In spontaneous labour, contractions build over hours or days and your body releases its own endorphins alongside them; with a drip, the build-up is compressed into a much shorter period. Having the waters broken also takes away the fluid cushion, which tends to make contractions feel sharper. On top of that, continuous monitoring limits how freely you can move, and changing position is one of the most effective coping tools there is. Finally, many women reach the active phase after a day or two of broken sleep, which lowers anyone's reserves.

What makes it easier is planning the pain relief rather than improvising it. Ask whether your unit has wireless telemetry monitoring, which lets you walk, use a birth ball or stand while still being monitored. In the ripening stage, a warm shower, a bath where allowed, a TENS machine, heat packs and simply moving around all help. In the active phase the options are the same as in any labour: gas and air, an injectable opioid, or an epidural.

It is entirely reasonable to decide in advance that you would like an epidural before the oxytocin drip is increased, and asking for one early in an induction is a practical choice, not a failure of nerve. Tell the midwife your preference at the start of the shift rather than at the peak of a contraction, and ask to be told before the drip rate goes up.

Risks and what can go wrong

Induction is a routine, well-established procedure, but it is still an intervention and it carries specific risks. Understanding them makes the monitoring feel less alarming, because almost everything the team does during an induction exists to catch one of these early.

The main one is over-stimulation of the uterus. Prostaglandins and oxytocin can occasionally make the uterus contract too often or for too long, without relaxing properly in between. This matters because the placenta refills with blood during the gaps, so if the gaps disappear the baby's oxygen supply can dip and the heart rate pattern changes. It is usually picked up quickly on the monitor and managed by removing the pessary, turning down or stopping the drip, changing your position, giving fluids, and if needed a medicine that relaxes the uterine muscle. This single risk is the reason continuous monitoring is required once the drip is running.

Other recognised risks include infection, which rises the longer the waters are broken and the more internal examinations are done; cord prolapse, which is rare and happens if the cord slips past a head that is still high when the waters are released, and is treated as an emergency; and heavier than usual bleeding after the birth following a long labour on oxytocin. Uterine rupture is very rare, but it is the reason prostaglandins are used cautiously, or avoided in favour of a balloon, in women who have a caesarean scar. An induced labour is also more likely than a spontaneous one to involve continuous monitoring, an epidural, and an assisted birth with forceps or ventouse.

One older worry deserves correcting. For years women were told that being induced would make a caesarean more likely. More recent evidence does not support that for induction at or after 39 weeks: compared with continuing to wait, induction at this stage does not appear to increase the chance of ending up with a caesarean. What it does change is the shape of the labour, not usually its destination.

It is equally important to say that the alternative is not risk-free. Declining or delaying an induction that was offered for a real clinical reason carries its own risks, and the decision is always a comparison between two sets of risk, never between risk and no risk at all.

• Your baby's heart rate pattern, continuously once the drip is running
• How many contractions you are having in every ten minutes, and whether the uterus relaxes between them
• Your temperature, pulse and blood pressure, for early signs of infection or rising blood pressure
• The colour and smell of the amniotic fluid once the waters are broken
• Progress of the cervix at each examination, and how low the baby's head is
• How you are coping, and whether your pain pattern has changed character

Your choices: declining, waiting and asking for a review

Induction is offered, not imposed. It is a medical procedure that requires your consent, and you can say yes, say not yet, or say no. Your care does not stop if you decline, and you cannot be induced without agreeing to it.

Before deciding, it is fair to ask for the reasoning in your specific case rather than in general. Useful questions: what exactly is the concern for me and my baby; what would happen if we waited another week; is there a test that would tell us more; which method are you proposing and why that one; is a mechanical method available instead; can I go home between stages; and what monitoring would you offer me if I choose to wait. A good team will not mind any of these, and a reason that cannot be explained simply is worth questioning.

If you decide to wait, ask for a clear monitoring plan to be written in your notes. In practice this usually means keeping a close eye on your baby's movements, regular CTG recordings, and ultrasound checks of growth and the amount of fluid, typically at least twice a week once you are past 42 weeks. Waiting with monitoring is a recognised option, not a refusal of care — it is simply a different plan, and you can change your mind about it at any point.

You are also entitled to ask for a review by a senior obstetrician, to bring your partner or a relative into the conversation, to ask for an interpreter, and to take a day to think. In some situations, particularly where the cervix is very unfavourable or there are other complications, a planned caesarean is a legitimate alternative to induction, and it is reasonable to ask whether it applies to you. Keeping up with your routine pregnancy follow-up appointments in the last weeks is what gives you the information to make any of these decisions properly.

What happens if the induction does not work

Sometimes the cervix simply does not respond. The term you may hear is a failed induction, which usually means that after a full course of ripening the cervix has not become favourable enough to break the waters, or that an attempt to break them was not possible.

This does not automatically mean a caesarean. Several things can be offered first. A rest period, often overnight, followed by a second cycle of ripening the next day is common and frequently works, because the cervix continues to change quietly in between. Switching method is another option: a balloon catheter after prostaglandin, or prostaglandin after a balloon. If the cervix has opened even slightly, it may become possible to break the waters after all and move on to the drip.

If none of that works, or if the drip is running and labour is not progressing, or if the baby's heart rate pattern is not reassuring, a caesarean will be recommended. That conversation should include why it is being recommended now, how urgent it is, and what your options are in the meantime.

Please hear this clearly: an induction that does not work is not a failure of your body or of your resolve. A cervix that is not ready is not being stubborn — it was not going to be ready on that particular timetable, and the induction simply revealed that. Ask for the reasoning to be explained in plain language, ask what the realistic alternatives are, and if the situation is not urgent, ask whether a night's sleep first is possible. Being rested changes how the next day goes.

How to prepare practically

The single most useful preparation is to pack and plan for a stay of several days rather than for an appointment. Women who expect to be home by evening and are still on the antenatal ward 36 hours later find it far harder than those who went in expecting a long haul.

A two-bag approach works well: a small bag you keep with you for the waiting stage, and a main bag for labour and afterwards that can stay in the car or with your partner. Sort out childcare and pet cover for longer than you think you need, and tell work that the timing is not precise.

• A long phone charging cable — hospital sockets are rarely next to the bed
• Snacks and a water bottle, after checking your unit's eating and drinking policy
• Loose, comfortable clothes and a dressing gown for walking the corridor, plus flip-flops for the shower
• Headphones, downloaded films or audiobooks, and something low-effort to read
• Lip balm, hair ties, a flannel, your own pillow if allowed
• Your maternity notes, ID and insurance paperwork
• Maternity pads and comfortable high-waisted underwear for afterwards — our guide to normal postpartum bleeding and lochia explains how much you will need
• Baby clothes, nappies and a car seat ready in the main bag

Ask the practical questions before the day rather than on arrival: which method is planned, whether the first stage is inpatient or outpatient, whether your partner can stay overnight on the antenatal ward or has to leave at a set time, what the eating and drinking rules are, and what time you should arrive. Partner visiting rules vary a great deal between hospitals and are often the thing women most wish they had known in advance.

Finally, prepare your body and your plan. Eat a proper meal and try to sleep the night before you go in; starting an induction already exhausted makes everything harder. Add a short paragraph to your birth plan that begins "if I am induced" and covers your pain relief preferences, whether you want mobile monitoring if it is available, who you want with you, and whether you want to be told numbers at each examination. Writing it down means you do not have to negotiate it during a contraction.

When to call the hospital straight away

If any part of your induction is happening at home — after a membrane sweep, or with an outpatient pessary or balloon in place — the following need a phone call to your maternity unit now, not at your next appointment. Call even if you feel you might be making a fuss; nobody on a labour ward minds being rung.

• Your baby's movements have reduced, stopped, or changed from their usual pattern
• Contractions that come more than five times in ten minutes, or do not ease off in between
• Pain that is constant rather than coming in waves, or severe pain between contractions
• Your waters break, especially if the fluid is green, brown or smells unpleasant
• A temperature, shivering, or feeling generally unwell
• Severe headache, flashing lights or blurred vision, sudden swelling of your face or hands, or pain under your ribs
• Feeling something in the vagina after your waters break — this needs an ambulance, not a car journey

Any fresh bleeding in late pregnancy should be assessed rather than watched at home. A small amount of pink or brown spotting after a sweep or an examination is expected and usually settles within a day, but bright red bleeding, bleeding heavier than a light period, or bleeding with pain is different. Our guide to bleeding during pregnancy and when to get help sets out how to tell these apart.

Use your emergency number — 112 in Turkey — for heavy bleeding, for feeling the cord, for a seizure, or if you cannot reach your unit and something feels seriously wrong. For everything else, ring the labour ward line in your notes. The staff would far rather talk to you about something that turns out to be nothing than hear about it the next morning.

Above all, remember that an induction is a plan, not a verdict. You are allowed to ask what is being done at each stage, why, and what the alternatives are, and you are allowed to change your mind along the way. Go through your own situation with the obstetrician or midwife who knows your pregnancy, because the right timing and the right method are always individual.