At 38 weeks, your baby is considered “early term,” and major medical guidelines recommend against inducing labor before 39 weeks without a medical reason. That said, there are several approaches, from home techniques to medical procedures, that may help encourage labor. Understanding what works, what doesn’t, and what your body needs to be ready for labor will help you have a realistic plan.
Why 39 Weeks Is the Standard Threshold
The American College of Obstetricians and Gynecologists (ACOG) states that nonmedically indicated deliveries, including inductions and cervical ripening, should not occur before 39 weeks. The final week between 38 and 39 makes a measurable difference: babies born at 39 weeks have lower rates of respiratory distress syndrome compared to those born at 38. If your provider recommends delivery before 39 weeks, there should be a documented medical reason, such as preeclampsia, gestational diabetes with complications, or concerns about the baby’s growth.
That doesn’t mean you’re powerless at 38 weeks. Some methods gently encourage your body to move toward labor without forcing it, and they’re worth discussing with your provider, especially as you approach your due date.
Cervical Readiness Matters More Than Timing
Before any induction method can work, your cervix needs to be ready. Providers assess this using the Bishop score, which evaluates five factors: how dilated your cervix is, how thin it’s become (effacement), its firmness, its position, and how low the baby’s head sits in the pelvis. A score of 6 or higher significantly increases your chances of a successful vaginal delivery. Below 6, your cervix likely needs ripening before contractions will lead anywhere productive.
This is why the same technique can work beautifully for one person and do nothing for another. If your body isn’t showing signs of readiness, most natural methods won’t override that. They work best when labor is already close.
Membrane Sweeping
A membrane sweep is one of the most effective low-intervention options your provider can offer. During a cervical exam, they use a finger to separate the amniotic sac from the lower part of the uterus. This triggers your body to release prostaglandins, the hormones responsible for softening the cervix and initiating contractions.
In a randomized controlled trial of women between 38 and 41 weeks, 91.4% of those who received a membrane sweep went into spontaneous labor, compared to 72.9% in the group that didn’t. The sweep group also delivered about a week earlier on average (39.5 weeks versus 40.6 weeks) and were far less likely to need a formal induction (9% versus 27%). The procedure shortened the interval between the intervention and delivery by about 7 days.
It’s not painless. Most women describe it as an intense cramping sensation that lasts a minute or two. You may notice spotting and irregular contractions afterward. Some people need more than one sweep before labor begins. If your cervix isn’t dilated enough for your provider to reach the membranes, they may simply massage the cervix instead, which has a milder effect.
Nipple Stimulation
Stimulating the nipples triggers your body to release oxytocin, the same hormone that drives labor contractions. A Cochrane review found that among women who used breast stimulation, 37.3% were in labor within 72 hours, compared to just 6.4% of women who did nothing. That’s a substantial difference, but there’s a catch: the effect was only significant in women whose cervix was already favorable. If your cervix isn’t softened and starting to dilate, nipple stimulation is unlikely to tip things over.
Most protocols used in studies involve stimulating one breast at a time for about 15 minutes, then switching, for a total session of roughly an hour. You can use your hands or a breast pump. Because this can cause strong contractions, it’s generally recommended that you try it only after discussing it with your provider, particularly if you have a high-risk pregnancy.
Sexual Intercourse
Semen contains the highest known biological concentration of prostaglandins, the same compounds used in medical cervical ripening agents. Orgasm also triggers oxytocin release, and the physical contact may stimulate the lower uterine segment. In theory, sex combines three mechanisms at once.
In practice, clinical trials haven’t produced strong proof that intercourse reliably starts labor. The prostaglandin concentration in semen, while high compared to other natural sources, is still far lower than what’s in a medical dose. That said, it carries minimal risk for most uncomplicated pregnancies (unless your water has broken or your provider has advised against it), so there’s little downside to trying.
Acupressure
Certain pressure points are thought to stimulate oxytocin release and uterine contractions. The most studied point is SP6, located on the inner leg about four finger-widths above the ankle bone. In a clinical trial comparing acupressure at this point to standard care, women in the acupressure group had a notably shorter first stage of labor (225 minutes versus 320 minutes) and reported lower pain scores throughout.
Other commonly targeted points include spots near the outer ankle and between the thumb and index finger. You can apply firm, steady pressure with your thumb for one to two minutes at a time. The evidence here is promising but limited, and most studies looked at acupressure during active labor rather than as a method for starting it. It’s low risk and free, which makes it a reasonable thing to try alongside other approaches.
Castor Oil
Castor oil is a traditional labor-starting remedy that works by stimulating the intestines, which can in turn irritate the uterus and trigger contractions. A large retrospective study found no significant differences in cesarean rates, instrumental delivery, meconium-stained fluid, or low Apgar scores between women who used castor oil and those who didn’t, suggesting it’s safer than its reputation implies.
The trade-off is comfort. Diarrhea and nausea are common side effects, and going into labor while dealing with both is not an experience most people enjoy. If you’re considering it, know that it works best when your cervix is already favorable, and the unpleasant gastrointestinal effects are nearly guaranteed.
What Happens During a Medical Induction
If your provider determines that delivery at 38 weeks is medically appropriate, the induction process depends on your cervical readiness. When the cervix isn’t yet soft and dilated, the first step is ripening it. This can be done with prostaglandin medications placed near the cervix, which soften the tissue and help activate the receptors that respond to oxytocin. Another option is a Foley bulb: a small catheter with a balloon that’s inserted into the cervix and inflated with water. The gentle pressure encourages dilation to about 3 to 4 centimeters over roughly 12 hours, at which point the balloon falls out on its own.
Once the cervix is ready, synthetic oxytocin delivered through an IV increases the frequency and strength of contractions. It’s not typically used alone for cervical ripening because it works best after the cervix has already been prepared. The whole process, from ripening to delivery, can take anywhere from several hours to a couple of days depending on how your body responds.
The Cesarean Question at 38 Weeks
One concern about early induction is whether it raises the risk of cesarean delivery. A large study of over 231,000 deliveries found something that surprises many people: women who were induced at 38 weeks actually had lower cesarean rates than those managed expectantly who delivered at 39 weeks. The expectant management group had 45% higher odds of cesarean. However, neonates in the 39-week group had lower rates of respiratory distress, which is why medical organizations still favor waiting when there’s no medical indication to deliver early.
This means the decision isn’t straightforward. For some women with specific risk factors, a 38-week induction may be the safer path. For others with uncomplicated pregnancies, the extra week in the womb benefits the baby’s lungs. Your provider can help weigh these factors based on your individual situation.
What’s Most Likely to Work
If you’re 38 weeks and eager to meet your baby, the most effective step you can take is asking your provider about a membrane sweep at your next appointment. Combine that with nipple stimulation at home if your cervix is already showing signs of readiness. Sexual intercourse and acupressure carry minimal risk and may contribute, though the evidence is weaker. Walking, staying active, and using a birthing ball won’t directly start labor, but they can help the baby descend into a favorable position, which supports the process.
The common thread across every method is that none of them reliably override a body that isn’t ready. They work with your biology, not against it. If your cervix is still firm and closed, even medical induction becomes a longer, more involved process. Patience is harder than any of these techniques, but at 38 weeks, your body is likely closer to labor than it feels.