Pregnancy Exercise Ball Guide: Sizing, Trimester Plans and Labor Positions
Ask maternity physiotherapists for one piece of equipment worth buying during pregnancy and the birthing ball wins nearly every time. It is the same anti-burst stability ball used in gyms, just sized differently and used with a different intent: pelvic mobility, comfort, and an upright, open position for late pregnancy and early labor. 
Part of our Complete Guide to Fitness Balls — see the ball types section for the difference between birthing, peanut and standard balls.
Birthing Ball vs. Standard Exercise Ball vs. Peanut Ball
| Feature | Birthing Ball | Standard Exercise Ball | Peanut Ball |
|---|---|---|---|
| Shape | Round | Round | Hourglass / dumbbell |
| Surface | Anti-slip textured | Often smooth | Anti-slip textured |
| Typical weight rating | 600–1,000 lb | 250–600 lb | 600–1,000 lb |
| Main use | Sitting, bouncing, labor | Training | Side-lying labor positions, epidural |
| Sizing basis | Height, one size up | Height | 40, 50 or 60 cm width |
| Typical price | $25–$45 | $15–$35 | $30–$50 |
Functionally, a good anti-burst exercise ball with an anti-slip finish is a birthing ball. What matters is the burst rating and the grip, not the label.
Birthing Ball Size Chart
| Your Height | Recommended Ball | Note |
|---|---|---|
| Under 5’3″ (160 cm ) | 55 cm | 65 cm if you want a higher, easier-to-rise seat |
| 5’3″–5’9″ (160–175 cm) | 65 cm | The most commonly recommended size |
| 5’10” and above (175 cm+) | 75 cm | Prevents hips dropping below knees |
The rule for pregnancy differs from general training: hips should sit clearly higher than knees — typically 5–10 cm — which reduces pressure on the pelvic floor and makes standing up from the ball far easier as you get further along. That is why sizing up is standard advice. Cross-check against the general exercise ball size guide.
➤ Check the anti-burst birthing ball (with pump )
Trimester-by-Trimester Plan
| Stage | Focus | Recommended Moves | Avoid |
|---|---|---|---|
| First trimester (0–13 wk) | Habit, posture, gentle core | Seated balance, pelvic tilts, wall squats, seated marching | New high-intensity work; anything that makes you breathless |
| Second trimester (14–27 wk) | Hip mobility, glute strength, upright posture | Hip circles, figure-eights, supported squats, seated arm work, cat-cow over the ball | Lying flat on your back for long periods; deep twists |
| Third trimester (28–40 wk) | Pelvic opening, comfort, labor prep | Gentle bouncing, swaying, kneeling lean-over, wide-knee rocking | Balance-dependent moves without support; anything on a slippery floor |
| Postpartum (6 wk+, cleared) | Pelvic floor, breathing, deep core | Seated breathing drills, pelvic tilts, supported bridges, soothing bounce with baby | Crunches and planks until pelvic floor and abdominal wall are assessed |
The Six Core Movements
- Seated hip circles — slow, controlled rotations, 10 each way. Keeps the pelvis mobile and eases third-trimester heaviness.
- Pelvic tilts — 15–20 slow reps. The single best move for pregnancy-related low back ache.
- Figure-eights — trace an eight with your hips, 10 reps. Adds a rotational component the circles miss.
- Wall-supported squats — ball between your lower back and the wall, descend to a comfortable depth, 10–12 reps. Builds the legs and pelvic floor you will use in labor.
- Kneeling lean-over — kneel on a mat, drape your upper body over the ball, and rock. Takes weight off the pelvis and encourages an optimal fetal position.
- Gentle bounce — feet planted wide, small vertical bounces for 1–2 minutes. Comforting, and widely used in early labor.
Using the Ball During Labor
| Position | How | Why It Helps |
|---|---|---|
| Upright seated sway | Sit with wide feet, rock hips side to side | Keeps you upright and mobile between contractions |
| Forward-leaning kneel | Kneel, arms and chest over the ball | Relieves back labor; partner can apply counter-pressure |
| Standing lean | Ball against a wall at chest height, lean in | Rest without sitting down |
| Peanut ball side-lying | Lie on your side, one leg over the peanut | Opens the pelvic outlet; usable with an epidural |
Upright and mobile positions are associated in the research literature with shorter first-stage labor and reduced requests for epidural analgesia compared with lying down. The ball is simply the easiest way to stay upright when you are tired. Confirm with your midwife whether your hospital or birth center supplies balls — many do, but bringing your own guarantees size and cleanliness.
Safety Rules
- Get clearance. Ball use is generally considered safe in uncomplicated pregnancies, but ask your provider first — especially with placenta previa, cervical insufficiency, preterm labor risk, high blood pressure or a multiple pregnancy.
- Never use a smooth-surface ball on a hard floor. Textured ball, non-slip mat, or both.
- Have a wall, sofa or partner within arm’s reach for the first few sessions.
- Inflate to 85–90%, not rock hard. A slightly softer ball grips the floor better and is easier to balance on. See how to inflate an exercise ball.
- Choose 600 lb+ anti-burst. Slow-deflation construction is non-negotiable here.
- Stop immediately for bleeding, fluid leakage, contractions before term, dizziness, chest pain or reduced fetal movement, and contact your provider.
Postpartum: The Ball’s Second Life
After your six-week check and clearance, the ball becomes a rehab tool: seated diaphragmatic breathing to reconnect the deep core, pelvic tilts to restore lumbo-pelvic control, and supported bridges before any loaded work. Skip crunches and planks until a pelvic health physiotherapist has assessed your abdominal wall — then progress into the beginner stability ball exercises and eventually the exercise ball core workout.
It also doubles as the most effective baby-soothing seat in the house: a gentle bounce while holding a newborn works when nothing else does.
➤ View the peanut ball for labor positions
If pregnancy has brought back ache with it, the gentle protocol in exercise ball for back pain is safe to combine with this plan, and office exercise ball benefits covers desk setup if you are working through your pregnancy.