At 40 weeks, you’re at full term and likely eager to meet your baby. Several natural methods have some evidence behind them, though none are guaranteed to work. The most studied options include nipple stimulation, castor oil, physical movement, and acupressure. How well any of these works depends largely on whether your body is already showing signs of readiness, specifically how soft, open, and thinned out your cervix has become.
Why Cervical Readiness Matters
Before trying any natural induction method, it helps to understand that your cervix needs to be “ripe” for labor to start. Your provider may have already mentioned something called a Bishop score, which rates how prepared your cervix is based on three main factors: how dilated (open) it is, how effaced (thin) it is, and how far down your baby’s head has dropped into your pelvis.
A cervix that’s still closed, thick, and high scores low, meaning labor is less likely to start on its own soon. A cervix that’s already a couple centimeters open, noticeably thinned, and paired with a baby whose head is low in the pelvis scores higher, and natural methods are more likely to tip things over the edge. If your provider has checked you recently and mentioned any of these measurements, that gives you a sense of where you stand. Most natural techniques work by nudging a body that’s already close to labor, not by forcing a process that hasn’t begun.
Nipple Stimulation
Nipple stimulation is one of the more evidence-backed natural methods. It works by triggering your body to release oxytocin, the same hormone that drives contractions during labor (and the same one used in the synthetic form given during hospital inductions). You can use a breast pump or your hands. Clinical protocols being studied involve stimulating for at least two hours, though many midwives suggest a pattern of stimulating one breast at a time for about 15 minutes, then switching, with breaks in between.
The key is consistency. Brief or sporadic stimulation is unlikely to produce results. If contractions begin, you can stop and see if they continue on their own. If they fade, resume stimulation. This method tends to be most effective when your cervix is already somewhat dilated and effaced.
Castor Oil
Castor oil is a strong laxative, and the intense intestinal cramping it causes can sometimes trigger uterine contractions. Research shows that 54% to 58% of women who take castor oil will begin labor within 24 hours. The recommended dose is two ounces, taken once by mouth.
The downsides are significant, though. Nausea is a common side effect, and the laxative action can cause diarrhea and dehydration at a time when you need energy and hydration for labor. Studies don’t recommend using castor oil before 40 weeks, so the timing would be appropriate, but you should avoid it entirely if you’ve had a prior cesarean section. Many providers don’t recommend it because starting labor while vomiting and dehydrated is a rough way to go.
Physical Movement and Curb Walking
Walking is the classic advice for a reason. Gravity helps your baby’s head press down on the cervix, and movement encourages the pelvis to open. Curb walking takes this a step further. You walk with one foot on a curb and the other on the street (or one foot on a step), creating an asymmetrical movement in your pelvis. The uneven stride may help your baby’s head descend further into the birth canal, increasing pressure on the cervix and encouraging it to dilate and thin.
There’s no strict protocol here. Walking for 20 to 30 minutes at a time, taking breaks as needed, is a reasonable approach. Even if it doesn’t trigger labor directly, staying active helps with fetal positioning, which can make labor smoother when it does begin. Use a partner or railing for balance, especially with curb walking, since your center of gravity at 40 weeks is not what it used to be.
Acupressure Points
Acupressure involves applying firm, sustained pressure to specific points on the body believed to stimulate uterine activity. The most commonly cited point for labor induction is called SP6, located about four finger-widths above your inner ankle bone, just behind the shin bone. You or a partner can press firmly on this spot during 30-minute sessions.
Research on SP6 acupressure has focused primarily on pain management and labor duration rather than induction itself, so the evidence for starting labor is limited. Still, it’s low-risk and easy to try at home. Some practitioners also recommend a point near the outer ankle and one in the webbing between thumb and index finger, though SP6 has the most research behind it.
Date Fruit Consumption
Eating dates in late pregnancy has gained popularity based on studies suggesting they help ripen the cervix. The typical recommendation is about 3 dates per day starting around 34 to 36 weeks. If you’re already 40 weeks and haven’t been eating them, starting now is unlikely to produce dramatic results since the benefit appears to come from consistent daily consumption over several weeks. That said, dates are nutritious and calorie-dense, which is helpful fuel heading into labor regardless.
Red Raspberry Leaf Tea
Red raspberry leaf tea is often grouped with labor induction methods, but it’s more accurately described as a uterine toner. The idea is that regular consumption in the third trimester strengthens the uterine muscle, potentially making contractions more effective once labor begins rather than triggering labor itself. Like dates, this is something that works best as a weeks-long practice rather than a last-minute intervention. If you’ve been drinking it throughout your third trimester, it may contribute to a more efficient labor. Starting at 40 weeks for the first time is unlikely to make a noticeable difference.
Membrane Sweeping: A Middle Ground
While not something you can do at home, a membrane sweep is worth mentioning because it sits between fully natural methods and medical induction. During a routine cervical check, your provider uses a finger to separate the amniotic membranes from the lower part of the uterus. This releases prostaglandins, hormones that help soften the cervix and can trigger contractions. About 50% of women go into labor within seven days of a sweep. It’s not guaranteed, and it can be uncomfortable, but it’s a simple in-office procedure that avoids the need for medications.
If you’re 40 weeks and your provider is already doing cervical checks, asking about a membrane sweep is a reasonable next step, especially if your cervix is showing some signs of readiness.
What Actually Makes the Difference
The honest reality is that no natural method has anywhere near a 100% success rate. The methods with the strongest evidence, nipple stimulation and castor oil, work best when your body is already on the verge of labor. Combining approaches (walking plus nipple stimulation, for example) is what many people try, and while there’s no research on specific combinations, the logic of stacking multiple gentle nudges makes intuitive sense.
Timing also matters. At exactly 40 weeks, you’re at your due date, but most first-time pregnancies go past it. About half of first pregnancies don’t result in spontaneous labor until 40 weeks and 5 days or later. If your pregnancy is healthy and your baby is doing well on monitoring, waiting a few more days while trying these methods is a perfectly reasonable plan. Your body may just need a little more time to finish preparing on its own.