At 38 weeks, your baby is considered “early term,” and most medical guidelines recommend against elective induction before 39 weeks. That distinction matters because the final week of pregnancy still contributes to lung development and other finishing touches. However, there are medical reasons your provider might support induction at 38 weeks, and several natural techniques may help encourage labor when your body is already close to ready.
Why 38 Weeks Is a Specific Cutoff
The American College of Obstetricians and Gynecologists (ACOG) states that nonmedically indicated delivery, including induction and cervical ripening, should not occur before 39 weeks and 0 days. This isn’t an arbitrary number. Research comparing births at 38 weeks versus 39 weeks found that waiting the extra week significantly reduced the rate of respiratory distress syndrome in newborns. There were no differences between the two groups for other neonatal complications like low blood sugar or jaundice, but lung maturity alone is enough to make that week meaningful.
That said, ACOG also recognizes a list of medical conditions where delivery before 39 weeks is appropriate: gestational diabetes requiring medication, preeclampsia, growth restriction, low amniotic fluid, and certain placental problems, among others. If your provider recommends induction at 38 weeks, they should document the medical reason and discuss it with you. If you’re hoping to induce simply because you’re uncomfortable or eager, most hospitals will ask you to wait one more week.
Natural Approaches With Some Evidence
Nipple Stimulation
Nipple stimulation triggers your body’s release of oxytocin, the same hormone hospitals use synthetically to start contractions. In clinical studies, women were asked to stimulate with a breast pump or by hand for periods of at least 30 minutes, with breaks of up to 15 minutes, aiming for a cumulative total of about 2 hours. Women in one pilot study stimulated for a median of roughly 3 hours and 18 minutes total. This is one of the few natural methods with a plausible, well-understood mechanism, though it works best when your cervix is already beginning to soften and thin.
Membrane Sweeping
A membrane sweep is something your provider does during a cervical exam. They use a finger to separate the amniotic sac from the lower part of the uterus, which releases natural prostaglandins that can help soften the cervix and trigger contractions. About 50% of women go into labor within seven days of a sweep. It’s mildly uncomfortable and can cause cramping and spotting afterward, but it’s considered safe and is one of the most common first steps before a formal medical induction. You can ask your provider about this at your 38-week appointment.
Eating Dates
This one sounds like folklore, but there’s reasonable data behind it. Women who ate six to seven dates per day starting at 37 weeks of gestation had significantly shorter active labor phases. In one study, 94.5% of the date-eating group went into spontaneous labor without needing medical intervention. Another study found that only 37% of the date group required labor augmentation, compared to higher rates in the control group. Dates are high in natural sugars, so if you have gestational diabetes, check with your provider first. Otherwise, six to seven dates a day (roughly 70 to 80 grams) starting around 37 weeks is the amount studied.
Sexual Intercourse
Semen contains a high concentration of prostaglandins, the same type of hormone-like substance used in medical cervical ripening. Orgasm also triggers oxytocin release, and the physical activity itself may stimulate the lower uterine segment. The theory is sound, but the actual clinical evidence is thin. Only one small study of 28 women has been included in Cochrane reviews, and no meaningful conclusions could be drawn from it. It’s safe for most pregnancies (unless your provider has told you to avoid intercourse), but don’t count on it as a reliable method.
Walking and Movement
Regular walking, particularly “curb walking” where one foot steps on a curb or raised surface while the other stays on the ground, creates asymmetrical movement in your pelvis. The idea is that this uneven motion encourages the baby’s head to descend further into the birth canal, increasing pressure on the cervix and promoting dilation. No large clinical trials have tested this rigorously, but it’s low-risk, keeps you active, and uses basic mechanics that make intuitive sense. Even standard walking helps with fetal positioning and can encourage early contractions if your body is already priming for labor.
Methods to Be Cautious About
Castor Oil
Castor oil works as a strong laxative that can also stimulate uterine contractions. In retrospective studies, the incidence of nausea, vomiting, and severe diarrhea was under 7%, and adverse effects of any kind occurred in fewer than 15% of births. While those numbers might sound reassuring, the experience of intense diarrhea and cramping while trying to start labor is genuinely unpleasant. The dehydration risk from prolonged vomiting and diarrhea is real, and the evidence for effectiveness is inconsistent. Most providers don’t recommend castor oil, and it’s worth talking to yours before trying it.
Herbal Supplements
Evening primrose oil, blue cohosh, black cohosh, and raspberry leaf tea are all commonly mentioned online. None of these have strong clinical evidence supporting their effectiveness, and some carry real risks. Blue cohosh in particular has been linked to adverse effects. These supplements aren’t regulated for purity or dosage, and “natural” doesn’t mean safe during pregnancy.
What Happens During a Medical Induction
If your provider determines that induction at 38 weeks is medically appropriate, the process typically starts with cervical ripening, especially if your cervix hasn’t begun to dilate or soften on its own. ACOG recommends either medication-based or mechanical methods for this step, and combining both can shorten the time from admission to delivery.
Medication-based ripening usually involves a small tablet placed near the cervix to release prostaglandins that soften and thin it over several hours. Mechanical ripening involves a small balloon catheter inserted through the cervix. As it’s gently inflated, it applies steady pressure that encourages dilation, typically to about 3 to 4 centimeters. Once the cervix is favorable, your provider can start a synthetic oxytocin drip to bring on regular contractions.
The full process varies widely. Some women progress quickly once ripening begins, while others need 12 to 24 hours or longer before active labor kicks in. First-time mothers tend to have longer inductions. Knowing this going in helps you set realistic expectations for the experience.
What You Can Realistically Do at 38 Weeks
If you don’t have a medical indication for early delivery, the most practical steps are the low-risk natural approaches: eating dates daily, staying active with walking, trying nipple stimulation for extended sessions, and asking your provider about a membrane sweep at your next visit. These methods work best in combination and when your body is already showing signs of readiness, like cervical softening or the baby dropping lower into your pelvis.
If you do have a medical reason for delivery at 38 weeks, your provider will likely schedule an induction and walk you through the specific plan. The gap between 38 and 39 weeks is small on the calendar but meaningful for your baby’s lungs, so the distinction between “I want to be done” and “there’s a medical reason” genuinely matters in how your care team will approach the timing.