How To Speed Up Labor At 39 Weeks Tips That Actually Work?

At 39 weeks, you are considered full term, and there is no proven way to make labor start on demand. The methods with real evidence behind them are limited and mostly apply to people whose labor has already begun. Most popular “natural induction” tricks have weak or no supporting research. A few carry real risks. This article separates what studies support from what is mostly folklore, and explains why timing matters more than most people realize.

Is 39 Weeks Full Term, and Why Does It Matter?

Yes. Pregnancy is measured at 40 weeks from the first day of your last menstrual period, and 39 weeks falls within the full-term window of 37 to 42 weeks. Babies born at 39 weeks generally do well.

There is a meaningful distinction here that many people miss. The American College of Obstetricians and Gynecologists (ACOG) defines 37 to 38 weeks and 6 days as “early term,” 39 to 40 weeks and 6 days as “full term,” and 41 weeks onward as “late term” and “postterm.” A baby born at 37 weeks is not the same as one born at 39 weeks. Lung and brain development continue through the final weeks.

This is why clinicians generally do not induce labor before 39 weeks without a medical reason. Inducing earlier than that, when there is no medical need, has been linked to higher rates of breathing problems and feeding difficulties in newborns. The evidence on elective induction at 39 weeks is discussed below, but the key point is that 39 weeks is a reasonable place to be, not a deadline you are behind on.

What Actually Works to Speed Up Labor at 39 Weeks?

The honest answer is that very few interventions reliably start labor in someone whose body is not ready. The strongest evidence exists for a medical procedure called a membrane sweep, and for formal induction of labor when a clinician recommends it.

Membrane sweep

A membrane sweep (also called a stretch and sweep) is a procedure where a clinician inserts a finger through the cervix and gently separates the amniotic sac from the uterine wall. This releases natural prostaglandins, hormone-like substances that can help the cervix soften and open.

Research consistently shows membrane sweeping can increase the chance of going into labor within the following days and can reduce the need for formal induction. It is typically offered around or after 39 weeks in many practices. It can be uncomfortable and may cause some spotting or cramping. It is not a guarantee, and it only works if the cervix is already somewhat favorable.

Induction of labor, when medically indicated

Formal induction uses medications or mechanical methods to start contractions. This is a medical decision made with your clinician, not something to self-initiate. Induction is recommended when continuing the pregnancy poses more risk than delivering — for example, with certain conditions like high blood pressure or when pregnancy passes 41 to 42 weeks.

One large randomized trial, often called the ARRIVE trial, found that elective induction at 39 weeks in first-time mothers was associated with a lower rate of cesarean delivery compared with waiting. That finding generated real debate among obstetricians, and it does not mean every pregnancy should be induced at 39 weeks. It means the decision is genuinely individual and worth a real conversation with your clinician.

Do Natural Induction Methods Like Castor Oil and Herbal Remedies Work?

Most natural induction methods have not been shown to reliably start labor, and some carry real risks. This is where popular advice and evidence part ways most sharply.

Castor oil

Castor oil is a laxative. It causes intestinal cramping, which some people believe can trigger uterine contractions. No good evidence shows it reliably induces labor, and it commonly causes nausea, vomiting, and diarrhea. There are case reports linking it to serious complications, including meconium passage (the baby passing the first stool before birth). Most clinicians advise against it.

Herbal remedies and supplements

Herbs marketed for induction — including blue cohosh and black cohosh — have not been shown to safely or effectively start labor. Blue cohosh in particular has been associated with reports of newborn harm. The evidence here is limited, and the safety concerns are real. Treat any supplement marketed to “bring on labor” with skepticism.

Sex, nipple stimulation, and spicy food

These are the most commonly shared tips, and the evidence is thin. Sexual intercourse is thought to work through prostaglandins in semen and through physical stimulation of the cervix, but studies have not shown it reliably induces labor. Nipple stimulation may release oxytocin, the hormone that drives contractions, and some small studies suggest it can help, but the research is not strong enough to call it proven. Spicy food has no supporting evidence at all.

None of these are dangerous in the way castor oil can be, but “harmless” is not the same as “works.”

Which Methods Have Weak or No Evidence?

A long list of popular methods falls into the “no good evidence” category. Knowing this can save you time, money, and worry.

• Walking and exercise: Staying active is good for you, but no strong evidence shows it starts labor.
• Pineapple: Contains an enzyme called bromelain, but the amount in fruit is far too small to matter, and no studies confirm it works.
• Acupuncture and acupressure: Some small studies suggest possible effects, but results are mixed and not strong enough to rely on.
• Evening primrose oil: Sometimes suggested to soften the cervix, but trials have not shown it works.
• Bouncing on a birth ball: May help with comfort and positioning, but does not start labor.

The pattern here matters. Many of these are low-risk, so some people try them for peace of mind. That is a personal choice. But it is honest to say the evidence does not support them as labor starters.

What Can You Do to Prepare Your Body for Labor?

You cannot force labor to start, but you can support your body in ways that are well established and low risk. These are about readiness and safety, not about triggering contractions.

Stay active within comfort. Gentle movement, walking, and stretching help circulation and can ease discomfort. They are not induction methods, but they support general health in late pregnancy.

Rest and hydrate. Fatigue and dehydration do not help labor. Sleep when you can, and drink water throughout the day.

Know the signs of labor. Regular contractions that get stronger and closer together, your water breaking, or a bloody show (a small amount of blood-tinged mucus) are signs to call your clinician. Recognizing them means you will not miss the real thing while chasing methods that do not work.

Keep your prenatal appointments. Your clinician can check your cervix, assess your baby’s position, and discuss options like a membrane sweep or induction timing if appropriate. This is where real decisions get made.

Talk about your preferences early. If you have strong feelings about induction or about waiting, raise them before 39 weeks. Decisions made in calm conversation tend to go better than decisions made in a hurry.

When Should You Call Your Provider About Induction?

Call your clinician if you have concerns about your baby’s movement, if you notice bleeding, if your water breaks, or if you have regular contractions. These are reasons to be checked, not reasons to try a home remedy.

Induction becomes a more serious conversation as pregnancy continues past your due date. Many clinicians recommend induction by around 41 to 42 weeks because the risk of certain complications rises with advancing gestational age. The exact timing is a clinical judgment, and it depends on your individual situation.

There is no evidence that waiting calmly at 39 weeks is harmful in a low-risk pregnancy. There is also no evidence that trying unproven methods makes labor come faster. What matters most is staying in contact with your care team and knowing when to be seen.