What Size Yoga Ball Do I Need for Pregnancy? A Height-Based Guide
The size of yoga ball you need for pregnancy depends on your height, not your weight or your stage of pregnancy. As a rule of thumb: choose a 55 cm ball if you are under 5'4" (162 cm), a 65 cm ball if you are between 5'4" and 5'10" (162–178 cm), and a 75 cm ball if you are taller than 5'10" (178 cm). The real test is how you sit on it: when seated with feet flat on the floor, your hips should be level with or slightly higher than your knees.
Below you will find a quick sizing chart, a simple way to confirm the fit at home, what to look for when buying, and how birthing balls and peanut balls are actually used during pregnancy and labor.
Yoga Ball Size Chart for Pregnancy
| Your height | Recommended ball size | Approximate seated height |
|---|---|---|
| Under 5'0" (152 cm) | 45–55 cm | ~18–21 in |
| 5'0" – 5'4" (152–162 cm) | 55 cm | ~21 in |
| 5'4" – 5'10" (162–178 cm) | 65 cm | ~25 in |
| Over 5'10" (178 cm) | 75 cm | ~29 in |
Two practical notes on this chart. First, balls compress when you sit on them, and inflation level changes the effective height, so these are starting points rather than absolutes. Second, many midwives suggest sizing up rather than down during late pregnancy: a slightly larger, slightly softer ball is easier to get on and off and keeps your hips above your knees, which is the position that encourages an open pelvis.
How to Check the Fit Once You Have the Ball
- Inflate the ball to its labeled diameter, not just until it feels firm. A measuring tape against a wall mark helps.
- Sit in the middle of the ball with both feet flat on the floor, about hip-width apart or slightly wider.
- Check your knees and hips. Knees should bend at roughly 90 degrees, with hips level with or a touch higher than the knees. If your knees sit above your hips, the ball is too small or underinflated.
- Check your stability. You should be able to lift one foot briefly without wobbling hard. If not, let a little air out for a wider, more stable base.
What if I am 5'1", 5'3", 5'5", 5'6", or 5'7"?
The chart is a range, not a step. If you are 5'1" or 5'3", the 55 cm ball will usually fit and a 65 cm can work as a "size up for late pregnancy" option. If you are 5'5", 5'6", or 5'7", the 65 cm ball is the standard pick and the right one for most of your pregnancy. If you sit on a 65 and your knees ride higher than your hips, the ball is underinflated, not too small — let a little air out and retest before you size up.
What to Look For When Buying a Birthing Ball
A birthing ball and a standard exercise or yoga ball are the same product; the marketing differs. What matters is the specification:
- Anti-burst construction (often labeled ABS or anti-burst). If punctured, the ball deflates slowly instead of popping. This is the single most important feature for pregnancy use.
- Weight rating of at least 500 lbs (about 225 kg) static load. Most quality balls far exceed what you will put on them, but check the label.
- A textured, non-slip surface, since you will be using it on hard floors and possibly with bare feet.
- A pump included, because you will want to adjust inflation as the ball stretches in over the first weeks.
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How to Use a Yoga Ball During Pregnancy
Common, well-tolerated uses include sitting on the ball instead of a chair for short periods (it encourages upright posture and gentle core engagement), slow hip circles and figure-eights to ease lower back and pelvic stiffness, gentle bouncing in late pregnancy, and kneeling forward over the ball to take weight off the lower back. Many of these movements pair naturally with breathing exercises from prenatal classes — if you are new to prenatal practice, our guide on when to start prenatal yoga covers what is appropriate trimester by trimester, and these prenatal yoga poses show positions that adapt well to a ball.
When should I start using a birthing ball?
There is no fixed week. Many people use one for posture and gentle mobility from the second trimester onward, and more actively in the final weeks. Clear it with your midwife or doctor first, especially if your pregnancy is high risk.
Can I use a yoga ball at 32 weeks pregnant?
Yes — 32 weeks is a common time to start using the ball more actively, especially for sitting and gentle hip mobility, because the bump is large enough that upright positions often feel more comfortable than a chair. Avoid deep bounces and any position that causes contractions, dizziness, or pelvic pain.
During labor, the same ball is often used for upright sitting and rocking between contractions, leaning forward over the ball while kneeling, and counter-pressure positions with a partner. Upright and mobile positions in labor are generally associated with shorter labors and less reported pain, and a ball is a useful tool for that — but it is a comfort tool, not a labor-shortening intervention in itself.
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Round Ball vs. Peanut Ball: Which Do You Need?
A peanut ball is an elongated, peanut-shaped ball used mostly during labor rather than during pregnancy. It is placed between the knees while lying on your side, keeping the pelvis open when you cannot be upright — for example after an epidural. Peanut balls became common in U.S. hospital labor units in the 2010s as a tool to keep the pelvis open when a laboring person is lying down, and they are now standard equipment in many birth centers. If you only buy one ball for pregnancy, buy the round one; ask your hospital or birth center whether they provide peanut balls before purchasing your own. Sizing for peanut balls also runs by height, with 40–50 cm covering most users.
Safety Tips
- Use the ball on a non-slip surface, never on a slick floor or rug that slides. A yoga mat underneath works well — see our guide to yoga mat thickness if you need one with grip and cushioning.
- Keep the ball away from heat sources and check it for wear regularly.
- Have something stable within reach (a wall, counter, or sturdy chair) when getting on and off, especially in the third trimester.
- Avoid positions that feel unstable, and stop anything that causes pain, dizziness, or contractions.
- If balance is a concern, many seated stretches work just as well from a chair — see our guide to seated yoga poses.
This article is general information, not medical advice. Pregnancy varies enormously from person to person — always check with your doctor, midwife, or physical therapist before starting ball exercises, especially if you have a high-risk pregnancy, pelvic girdle pain, or any complication.
FAQ
It depends on your height. A 65 cm ball suits most people between 5 ft 4 in and 5 ft 10 in, while a 75 cm ball is better above 5 ft 10 in. When seated, your hips should be level with or slightly above your knees - if your knees ride higher than your hips, size up.
Yes. A birthing ball is a standard anti-burst exercise ball marketed for pregnancy. What matters is the specification: anti-burst construction, an adequate weight rating, and the right diameter for your height.
There is no fixed week. Many people use one for posture and gentle mobility from the second trimester onward, and more actively in the final weeks. Clear it with your midwife or doctor first, especially if your pregnancy is high risk.
There is no solid evidence that bouncing starts labor. Upright positions and gentle movement may help the baby settle into a good position and can ease discomfort, but a ball is a comfort tool, not an induction method.
Inflate close to the labeled diameter for normal use, but slightly softer is fine in late pregnancy - it widens the base and makes the ball more stable and easier to get on and off.
If you teach prenatal students and want formal training in this area, our overview of prenatal yoga certification (RPYT) explains the pathway.
Have a correction? Contact us.
Last update 2026-09-10. Price and product availability may change.
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