At 39 weeks, your baby is considered full term, and there are both home techniques and medical options that can help labor get started. None of the at-home methods are guaranteed, but several have real evidence behind them. If you’re a healthy first-time mother, elective induction at 39 weeks is also a well-studied, safe choice that actually lowers your chance of needing a cesarean.
Ask Your Provider for a Membrane Sweep
A membrane sweep is the simplest clinical method to jumpstart labor without a full induction. During a regular office visit, your provider uses a gloved finger to separate the amniotic sac from the lower part of the uterus. This releases natural hormones called prostaglandins, which help soften and open the cervix. About 50% of women go into labor within seven days of a sweep.
The procedure takes less than a minute and doesn’t require a hospital visit. It can be uncomfortable, similar to a more intense cervical check, and you may have cramping, spotting, or irregular contractions afterward. Some women need more than one sweep before labor begins. If your cervix is already starting to soften and open, a sweep is more likely to work.
Nipple Stimulation
Nipple stimulation is one of the few home methods with actual physiological backing. It triggers the release of oxytocin, the same hormone hospitals use (in synthetic form) to induce labor. Research has tested this using an electric breast pump for two or more hours, and the technique produced adequate contractions at lower oxytocin levels in the bloodstream compared to an IV drip.
If you want to try this at home, use a breast pump or manual stimulation on one breast at a time for about 15 minutes, then switch sides. Take breaks if contractions become very strong or come closer than three minutes apart. This method works best when your body is already showing signs of readiness, like a softening cervix.
Movement and Positioning
Staying active at 39 weeks won’t force labor to start, but specific types of movement can encourage your baby to drop deeper into the pelvis. That added pressure on the cervix is what signals your body to begin dilating.
Curb walking is one popular technique. You walk with one foot on the curb and one on the street, creating an asymmetrical movement in your pelvis. The theory is that this uneven stride helps the baby’s head descend further, increasing cervical pressure. Sitting, bouncing, or doing hip circles on a birthing ball works on a similar principle by encouraging downward movement and reducing pelvic tension. Neither method has been tested in rigorous clinical trials, but both are low-risk and may help with fetal positioning even if they don’t directly trigger contractions.
General walking, climbing stairs, and squatting are all reasonable ways to use gravity to your advantage. Listen to your body and stop if anything feels painful or off.
Castor Oil: Proceed With Caution
Castor oil has been used for generations to try to start labor. It works as a strong laxative that stimulates the intestines, which sit close to the uterus. That stimulation can sometimes trigger uterine contractions. Reviews of the evidence suggest it can be effective at promoting contractions, and serious side effects haven’t been widely documented in studies. But the experience itself is unpleasant. Expect nausea, diarrhea, and cramping. Starting labor while dehydrated from hours of diarrhea is not ideal, so if you choose to try it, stay well hydrated and discuss it with your provider first.
What Happens During a Medical Induction
If home methods don’t work, or if you and your provider decide to schedule an induction, it helps to know what the process looks like. How your induction unfolds depends largely on your cervix. Providers assess cervical readiness using a scoring system based on five factors: how dilated you are, how thin (effaced) your cervix is, how soft it feels, its position, and how far down the baby’s head has dropped. A score of eight or higher means your body is close to labor on its own, and induction is very likely to succeed.
If your cervix isn’t ready yet, it needs to be “ripened” first. This is often the longest part of the process. Your provider may place a small balloon catheter through the cervix, which applies gentle mechanical pressure to help it open. Alternatively, they may use a medication (a type of prostaglandin) placed near the cervix to soften it. The combination of a balloon catheter with cervical softening medication tends to be the most effective approach, balancing speed with safety. This ripening phase can take anywhere from several hours to overnight.
Once your cervix is favorable, your provider can break your water and start a synthetic oxytocin drip through an IV to bring on regular contractions. For women whose cervix is already soft and partially dilated, this step alone may be enough to get labor going quickly.
Why 39-Week Induction Is Worth Discussing
There’s a lingering belief that induction leads to more C-sections, but a landmark trial involving over 6,000 healthy first-time mothers found the opposite. Women induced at 39 weeks had a cesarean rate of 18.6%, compared to 22.2% among those who waited for labor to start on its own. That’s a meaningful reduction. The induced group also had lower rates of preeclampsia and gestational hypertension, and their babies were less likely to need breathing support in the first few days of life.
The American College of Obstetricians and Gynecologists now recognizes 39-week induction as a reasonable option if you’re a first-time mother carrying one baby and both you and the baby are healthy. Not every hospital offers it, since it requires adequate staffing and resources, but it’s worth asking about.
What Probably Won’t Work
Spicy food, pineapple, evening primrose oil, and sex are commonly recommended online. Spicy food and pineapple have no evidence supporting them. Evening primrose oil is thought to help soften the cervix, but studies haven’t shown it shortens the time to labor. Sex introduces prostaglandins (found in semen) and can trigger mild contractions through orgasm, but trials haven’t demonstrated that it reliably starts labor either. None of these are harmful at 39 weeks, but managing expectations matters.
How to Tell Your Body Is Getting Close
Before labor begins, your body usually drops some hints. You may notice your baby sitting lower in your pelvis, increased pelvic pressure, more frequent Braxton Hicks contractions, loss of the mucus plug (a thick, sometimes blood-tinged discharge), or a burst of restless energy sometimes called “nesting.” Loose stools in the day or two before labor are also common as your body clears out in preparation.
Real labor contractions are different from Braxton Hicks in a few key ways: they come at regular intervals, get progressively closer together, grow stronger over time, and don’t go away when you change position or drink water. If your contractions are consistently five minutes apart, lasting one minute each, for at least one hour, that’s the typical signal to head to the hospital.