The best way to sit during pregnancy is upright with your back straight, your weight distributed evenly on both hips, and your knees level with or slightly lower than your hips. This position supports your shifting center of gravity, reduces back pain, and in the later weeks can even help your baby settle into a better position for birth. While pictures are helpful, understanding the principles behind each position lets you adapt to any chair, sofa, or workspace you encounter.
The Basic Upright Sitting Position
Start with a firm chair that has a back, like a dining or kitchen chair. Sit with your bottom all the way against the backrest so the chair supports the curve of your lower back. Keep your hips and knees at roughly a 90-degree angle, with your feet flat on the floor. Your weight should be even across both sit bones, not shifted to one side. If the chair doesn’t support the natural curve of your lower spine, place a firm pillow or rolled towel in the gap between the chair and the small of your back.
This is the foundation for almost every sitting variation during pregnancy. It keeps your pelvis neutral, your spine aligned, and prevents the kind of slouching that puts extra load on already-strained ligaments.
Why Slouching Matters More Than You Think
During pregnancy, your center of gravity shifts forward and upward as your belly grows. Your body compensates by increasing the arch in your lower back, which is already a recipe for soreness. Slouching on a sofa or reclining with your knees higher than your hips adds to this strain.
But posture also affects your baby. The heaviest part of your baby is the back, and gravity pulls it toward the lowest side of your abdomen. When you sit upright or lean slightly forward, the baby’s back tends to swing toward the front of your belly, settling into what’s called an anterior position: head down, facing your spine. This is the ideal alignment for birth. When you slouch back or recline deeply, the baby’s back can drift toward your spine instead, resulting in a posterior position. Posterior babies often mean longer, more painful labor because the baby has to rotate further to navigate the pelvis.
This doesn’t mean one evening on the couch will flip your baby the wrong way. But in the final weeks of pregnancy, spending more of your sitting time upright and leaning slightly forward gives your baby the best chance to settle favorably.
Sitting at a Desk or Workstation
If you work at a desk, your chair and setup need to evolve as your pregnancy progresses. A height-adjustable chair is ideal. Set it so your feet rest flat on the floor, your knees are at or just below hip height, and you can reach your keyboard without stretching forward. If your feet don’t reach the floor, use a footrest. Place a lumbar support pillow against your lower back so you don’t have to actively hold the curve of your spine all day.
Position your monitor at eye level so you aren’t tilting your head down. Keep frequently used items within arm’s reach so you avoid twisting. As your belly grows, you may need to move the keyboard and monitor farther out and adjust your chair height to accommodate. A height-adjustable desk that lets you alternate between sitting and standing is especially useful in the second and third trimesters, when sitting for long stretches becomes uncomfortable.
Take regular breaks. Standing up and moving every 30 to 45 minutes reduces stiffness and helps circulation in your legs.
Sitting in the Car
Car seats are one of the biggest posture challenges during pregnancy because they naturally tilt you backward, putting your knees higher than your hips. This is exactly the position that encourages your baby toward a posterior position and loads extra pressure onto your lower back.
Use a firm lumbar support cushion or a rolled towel behind your lower back. If possible, tilt the seat base so it’s more level rather than sloping backward. Slide the seat forward enough that you can reach the pedals without fully extending your legs, and keep your back against the seat. On long drives, stop every hour to stand and walk for a few minutes.
Sitting on Sofas and Armchairs
Soft, deep sofas are comfortable but problematic. They let you sink back so your pelvis tilts posteriorly, your knees rise above your hips, and your lower back rounds. If you have a firm sofa, you can make it work by sitting toward the front edge and placing a firm cushion behind your lower back. If the sofa is very soft, add a cushion under your bottom to raise your hips above your knees.
A practical alternative: sit on a dining chair while reading or watching television, especially in the third trimester. You can rest your elbows on a table in front of you and lean slightly forward. Some women find sitting backward on a chair, with their arms resting on the backrest, surprisingly comfortable. This naturally tilts the pelvis forward and takes pressure off the lower back.
Sitting on the Floor
Floor sitting can be comfortable if you do it right. Tailor sitting (similar to cross-legged but with the soles of your feet touching and knees dropped outward) opens the pelvis and can ease hip tightness. Sit on a firm cushion or folded blanket to elevate your hips above your knees, which keeps your pelvis in a forward tilt and prevents rounding of the lower back.
If tailor sitting is uncomfortable, kneel upright with a cushion between your calves and bottom, or sit on your heels with a pillow for support. Both positions keep your pelvis tilted slightly forward and are especially useful in the final weeks for encouraging optimal fetal positioning. Avoid sitting flat on the floor with your legs extended straight in front of you, as this rounds the lower back and can strain the hamstrings.
Using a Birth Ball as a Chair
A birth ball (also called an exercise or stability ball) is one of the most versatile seating options during pregnancy. It provides a broad, stable base while naturally encouraging an upright posture and a slight forward pelvic tilt. Because the ball has some give, it also lets you gently rock your hips, which can relieve pressure and help your baby move into an optimal position.
Choose the right size for your height. When you sit on the ball with your feet flat on the floor, your hips should be level with or slightly higher than your knees. For most women between 5’4″ and 5’10”, a 65 cm ball works well. Shorter women may need a 55 cm ball. Place the ball on a non-slip surface, and consider positioning it against a wall or between two pieces of furniture when you’re first getting used to it. Many women use a birth ball at their desk, alternating with a regular chair throughout the day, and then continue using it during early labor.
Positions to Avoid
Crossing your legs while seated shifts your pelvis out of alignment and can worsen pelvic girdle pain, a condition that affects the joints at the front and back of the pelvis. The Royal College of Obstetricians and Gynaecologists specifically lists crossing your legs as something to avoid if you’re experiencing pelvic pain. Even without pain, crossing your legs reduces circulation and creates uneven pressure on your hips.
Sitting twisted, such as turning to face someone beside you for a long conversation, strains the round ligaments and pelvic joints. Sitting for long periods in any single position, even a good one, increases stiffness and discomfort. And reclining deeply with your knees higher than your hips, whether in an armchair, recliner, or car seat, is worth minimizing in the third trimester for both comfort and fetal positioning reasons.
If You Have Pelvic Girdle Pain
Pelvic girdle pain, sometimes called symphysis pubis dysfunction, makes sitting especially challenging. The key adjustments are keeping your sessions shorter and using a wedge-shaped cushion that tilts your pelvis slightly forward. Sitting on a softer surface like a cushioned chair can also reduce pressure on the pubic joint.
Women with pelvic girdle pain often find that shorter sitting periods significantly reduce their symptoms. Aim to stand and reposition every 20 to 30 minutes. A pregnancy support belt worn while sitting can also help stabilize the pelvis. When standing up, keep your legs together rather than pushing off with one leg, which stresses the pubic joint unevenly. Pelvic floor exercises done regularly while seated can help support the pelvic joints from the inside.
Getting Up From a Chair Safely
How you transition out of a chair matters as much as how you sit in it. Scoot forward to the edge of the seat first. Place your feet flat on the floor, hip-width apart. Lean forward from your hips so your nose comes over your toes, then push up through your legs rather than pulling yourself up with your arms or straining your abdominal muscles. Keep your weight even on both feet. This technique protects your lower back and pelvic joints, and becomes increasingly important as your belly grows and your balance shifts forward in the third trimester.