Birth Partner | For Everyone at the Birth

The 30 Percent Difference

One of the most compelling findings in birth physiology is this: when you squat, the diameter of your pelvic outlet can increase by as much as 30 percent compared to lying on your back. This happens because pregnancy hormones soften the ligaments around your pelvic joints, making them flexible. When you are upright and squatting, your sacrum, the triangular bone at the base of your spine, is free to move backward, creating more space for your baby to descend. When you lie on your back or recline, your weight rests on your sacrum, locking it in place and narrowing the passage.

Gravity as Your Ally

In an upright position, gravity works with you rather than against you. When you are standing, squatting, or kneeling, your baby's weight presses down on your cervix, helping it dilate more efficiently. Your uterus can contract at its best angle, requiring less effort from your body. Between contractions, the baby's head maintains gentle pressure on the cervix, which encourages steady progress. In a reclining position, your uterus has to work against gravity to tilt forward during contractions, which can make labor longer and more painful.

How Different Positions Work

Each upright position offers unique benefits. Squatting opens the pelvis to its widest and is the most effective for the final stages of labor. Kneeling is gentler and often preferred when you need rest between strong contractions. The all-fours position can help a baby who is in a posterior position rotate into a better alignment. Standing and leaning forward relieves back pain and allows you to sway or rock your pelvis. The key is not to find one perfect position but to move freely between them as your body and your baby dictate.

What Happens When You Lie Down

The supine or semi-reclining position, lying on your back, is the single most disadvantageous position for labor and birth. The weight of your pregnant uterus compresses the major blood vessels along your spine, reducing blood flow to your placenta and oxygen supply to your baby. Your contractions are less efficient, labor tends to be longer, and pain increases because your pelvic nerves are compressed. This position was adopted for the convenience of obstetricians using forceps, not because it is good for mothers or babies. Reclaiming an upright position is one of the most powerful choices you can make.

Practicing Positions During Pregnancy

Your body needs time to become comfortable in the positions that will serve you during labor. Practicing during pregnancy builds muscle memory and confidence. The yoga-based preparation involves regular squatting, kneeling, and forward-leaning positions to open your hips and strengthen your legs. A partner can help support you as you practice. Simply sitting in a deep squat while reading or watching television, or using a low stool to practice supported squatting, will prepare your body. The more familiar these positions feel before labor, the more instinctively you will use them when the time comes.