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Labor & postpartum Call your provider

Post-term pregnancy

Also known as Overdue pregnancy, Prolonged pregnancy, Postdates. At or beyond 42 weeks; late-term is 41 weeks.

A pregnancy is post-term once it reaches 42 weeks, two full weeks past the due date. Being overdue breeds impatience and worry, so it helps to know two things. First, many pregnancies labeled overdue are not truly late; the due date was simply off, which is why accurate early dating matters so much. Second, once you pass 41 weeks the risks to the baby do begin to rise gradually, which is why your provider steps up monitoring and will raise inducing labor. Most overdue babies are born perfectly healthy.

Know the warning signs When to call a provider
How common
Roughly 1% to 3%
Of pregnancies reach 42 weeks; fewer when dating is confirmed by early ultrasound.
When
42 weeks and beyond
Late-term is 41 weeks; post-term is 42 weeks (294 days) or more.
Urgency
Monitored closely
Not an emergency, but surveillance increases and induction is offered; less movement needs a prompt call.
Outlook
Usually healthy
Most post-term babies are born healthy with monitoring and timely delivery.

Understanding it

What is post-term pregnancy?

Pregnancy is dated from the first day of your last period, with a due date at 40 weeks. It is late-term at 41 weeks and post-term once it reaches 42 weeks, or 294 days. Reaching your due date without labor is entirely normal, only about 1 in 20 babies arrive on the date itself, so being a little overdue is common and rarely cause for alarm.

The most common reason a pregnancy looks post-term is simply a wrong due date. If dating was based on an uncertain last period rather than an early ultrasound, you may be less far along than the calendar says. This is why an early dating ultrasound is so valuable: it prevents a mislabel and the unnecessary interventions that follow. When dating is accurate, truly post-term pregnancy is uncommon.

Still, past 41 weeks the risks to the baby do rise gradually. The placenta, after months of work, can become less efficient, so the baby may get less oxygen and fewer nutrients. Amniotic fluid can decline, which can let the cord be compressed. Babies can grow large, making delivery harder, and the small chance of stillbirth begins to climb, most after 42 weeks. These risks are why being overdue is watched rather than simply waited out.

From around 41 weeks, your provider steps up monitoring with tests like the non-stress test and checks of the amniotic fluid, and will discuss inducing labor, generally offered around 41 weeks and recommended by about 42 and a half weeks. The one thing to watch at home is your baby's movements: if they slow or change, call promptly. With this care, the vast majority of overdue babies are born healthy.

Symptoms

What are the symptoms?

Post-term pregnancy has no symptoms of its own; it is defined by the calendar. The main thing to monitor is your baby's movements, which should stay strong and regular.

Early signs

  • No symptoms; the diagnosis is based on dates, not on how you feel
  • The baby continues to move regularly, which is a reassuring sign
  • Sometimes a larger baby, or, with declining fluid, a belly measuring smaller
  • Being past your due date without signs of labor

Emergency signs — call 911

  • A decrease in your baby's movements, or movements that feel different or weaker, which warrants a prompt call
  • No sense of the baby moving over a couple of hours despite trying to prompt movement
  • Your water breaking, especially if the fluid is green or brown
  • Regular painful contractions, bleeding, or a gush of fluid

Why it matters

Risks to you and baby

Stillbirth risk rises after the due date

This is the central reason post-term pregnancy is watched. Stillbirth risk is low but begins to rise, most notably after 42 weeks, as the placenta ages. Monitoring and timely induction are aimed squarely at preventing it.

A declining placenta

Over time the placenta can become less efficient, so the baby may get less oxygen and fewer nutrients. That can leave a baby stressed in labor or, occasionally, one that stops growing well.

Low fluid and cord compression

Amniotic fluid tends to fall past term, which can let the cord be compressed and affect the baby's heart rate. Checking the fluid level is part of post-term monitoring.

A larger baby and meconium

Extra time can mean a larger baby and a harder delivery, and post-term babies more often pass their first stool (meconium) before birth, which can be inhaled. Both are managed by the delivery team.

How it's found

How is it diagnosed?

Post-term pregnancy is diagnosed by the dates, so accurate dating is the foundation. Once late-term, the focus shifts to monitoring the baby's wellbeing.

Accurate pregnancy dating

An early ultrasound, ideally in the first trimester, sets the true due date and prevents a wrong overdue label. This is the key to diagnosing post-term correctly.

Non-stress test

Watches the baby's heart rate and how it responds to movement, a reassuring sign of wellbeing. Started around 41 weeks and repeated, often twice weekly.

Amniotic fluid check and biophysical profile

Ultrasound measures the fluid around the baby, low fluid being a reason to deliver, and can join the non-stress test in a fuller assessment of the baby's condition.

Dating is done early. Surveillance of the baby typically begins around 41 weeks and continues, usually twice a week, until delivery.

Treatment

How is it managed?

Care combines increased monitoring of the baby with a timely plan for delivery. Induction is offered around 41 weeks and recommended by about 42 and a half weeks.

Treatment paths

From around 41 weeks, monitoring steps up with non-stress tests and fluid checks, usually twice a week, while your provider discusses inducing labor. Induction is generally offered around 41 weeks and recommended after 42, no later than about 42 and a half weeks, because by then the risks of continuing outweigh those of delivery. Sweeping the membranes, a quick office procedure, can also nudge labor to start.

Monitoring

Twice-weekly testing of the baby's heart rate and the fluid level, plus your own tracking of the baby's movements, keeps a close watch until delivery.

Can it recur?

Yes, it tends to repeat. After one post-term pregnancy, the chance of another is roughly 15% to 20%, about double the baseline. So your provider will date a future pregnancy carefully and plan monitoring and delivery timing accordingly.

What you can do

Can it be prevented?

  • Get an early dating ultrasound

    The most effective step is confirming your due date early, ideally in the first trimester. Accurate dating prevents a wrong overdue label and the interventions that follow.

  • Keep your monitoring appointments

    Once you reach 41 weeks, the twice-weekly checks of your baby's heart rate and fluid level catch problems early. Keeping them is the core of safe post-term care.

  • Track your baby's movements

    Your baby should keep moving regularly right up to birth. A decrease or change is the main warning sign, so pay attention and call promptly.

  • Discuss induction timing

    Talk with your provider about when to induce. Offered around 41 weeks and recommended by about 42 and a half, well-timed induction keeps the small but rising risks in check.

Who is more at risk

Risk factors

An inaccurate due date
The most common reason for an apparent post-term pregnancy, which is why early dating matters so much.
A previous post-term pregnancy
Having gone overdue before makes it more likely again.
Recurrence of about 15% to 20%, roughly double the baseline.
A first pregnancy
First-time pregnancies are somewhat more likely to go past the due date.
Genetics and a male baby
A family or personal history of post-term pregnancy, and carrying a boy, are both linked to going overdue.
Obesity
A higher body weight is linked to a greater chance of a prolonged pregnancy.

Do not wait

When to call your provider or 911

  • Call your provider promptly if your baby's movements decrease, weaken, or feel different.
  • Seek care if you do not feel your baby move over a couple of hours despite trying to prompt movement.
  • Go in if your water breaks, especially if the fluid is green or brown.
  • Contact your provider for regular painful contractions, bleeding, or a gush of fluid.
  • Discuss your monitoring and induction plan once you pass your due date, and keep all scheduled tests.

Talking to your team

Questions to ask your provider

  • How certain is my due date, and was it set by an early ultrasound?
  • When will you start monitoring the baby, and how often?
  • When would you recommend inducing labor, and why then?
  • What are the risks of waiting versus inducing for me?
  • What movement changes should make me call right away?
  • Given this pregnancy went overdue, what does that mean for next time?

Keep reading

More on post-term pregnancy

All pregnancy guides articles

Good to Know

Post-term pregnancy FAQs

Common questions about post-term pregnancy, answered.

Is being overdue dangerous?

A little overdue is common and usually fine, but past 41 weeks the risks to the baby rise gradually as the placenta ages and fluid can decline. The most serious, stillbirth, is uncommon but climbs most after 42 weeks. That is why being overdue is monitored closely and induction offered, rather than waiting indefinitely.

Why does my due date matter so much?

Because the most common reason a pregnancy looks post-term is a wrong due date. If dating came from an uncertain last period, you may not be as far along as the calendar says. An early ultrasound gives an accurate date, sparing you a mislabel and unnecessary interventions. It is the foundation of good post-term care.

Will I be induced, and when?

Very likely, if you go past your due date. Induction is generally offered around 41 weeks and recommended by about 42 and a half, because by then the risks of continuing outweigh those of delivering. Your provider weighs your cervix, your baby's monitoring, and your preferences; many people are induced between 41 and 42 weeks.

What monitoring will I have past my due date?

From around 41 weeks, usually about twice a week: a non-stress test that watches your baby's heart rate, and an ultrasound check of the amniotic fluid, sometimes combined into a biophysical profile. These confirm your baby is doing well; low fluid or a concerning result is a reason to deliver.

Can I do anything to bring on labor naturally?

The one office measure your provider may offer is sweeping the membranes, a quick internal procedure that can encourage labor. Popular home methods, walking, spicy food, sex, have little proven effect, though they are generally harmless. When you are truly post-term, medical induction is the reliable, safe route, so discuss timing with your provider.

Does the baby keep growing if I am overdue?

Often yes, which is why post-term babies can be larger and delivery a bit harder. In some cases, though, the aging placenta means less nourishment. Both are why monitoring and timely delivery matter, so the baby comes while conditions are still good.

Will I go overdue again next time?

There is a real chance, roughly 15% to 20% after one post-term pregnancy, about double the baseline, and the tendency is partly genetic. Knowing it, your provider will confirm your due date early next time and plan monitoring and induction timing so you do not go too far past term again.

Medically Reviewed · Updated

Reviewed by Dr. Grace Lin, MD, FACOG · OB-GYN

Obstetrician-gynecologist focused on reproductive and sexual health for women: pregnancy, BV, yeast, trichomoniasis and HPV/cervical screening. Our editorial guidelines →

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