Pregnancy wedge pillow: a small support that makes side sleeping easier
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- Small firm memory foam bump wedge. Best for: Side sleepers who want light belly support without a bulky pillow. See options on Amazon
- Two-piece wedge set (bump and back). Best for: People who keep waking up on their back. See options on Amazon
- Large bed wedge for reflux. Best for: Nighttime heartburn in later pregnancy. See options on Amazon
- C-shaped or U-shaped full body pillow. Best for: People who want back, bump and knee support in one piece. See options on Amazon
Why side sleeping matters later in pregnancy
A 2025 review in the Canadian Medical Association Journal (CMAJ) advises that, starting at 28 weeks, pregnant patients should avoid going to sleep on their back. It cites a meta-analysis in which going to sleep on the back, compared with the left side, was linked to stillbirth (adjusted odds ratio 2.63). Before 28 weeks, the review says, posture does not affect pregnancy outcomes.
Which side? The Sleep Foundation says experts often recommend the left side as pregnancy progresses and that occasional right-side sleeping is fine. The CMAJ review adds that going to sleep on the right side appears to be as safe as the left. The key is getting off your back at the start of sleep.
Four ways to use one wedge
| Placement | What it does | Who it suits |
|---|---|---|
| Under the bump | Takes the pull off your belly and lower back when on your side | Second and third trimester side sleepers |
| Behind your back | Acts as a stop so you are less likely to roll onto your back | People who wake up on their back |
| Between the knees | Keeps the top leg from dropping and twisting the hips | Hip or pelvic aches |
| Under head and upper back (larger wedge) | Raises the upper body for heartburn | Nighttime reflux |
The Sleep Foundation notes that when the upper leg collapses onto the lower leg it can twist the spine, and that a small pillow between the knees can relieve hip pressure. For a dedicated knee option, see our side sleeper knee pillow guide.
Wedge or full body pillow?
A wedge is small. It supports one spot at a time, travels well, and leaves room in a shared bed. A U-shaped or C-shaped body pillow supports your back, bump and knees at once but takes up a lot of the mattress.
If you are deciding mainly to avoid back sleeping, the evidence is reassuring for simple options. In a small randomized trial described in CMAJ, pregnancy pillows and regular pillows were equally effective at reducing back sleep in late pregnancy. In other words, you do not need a special product to follow the advice. A wedge is about comfort and convenience.
What to look for
- Firm foam. A wedge under the bump needs to hold its shape. Soft fills flatten under the weight.
- Gentle slope and modest size. You want it to cradle the belly, not push it up.
- Grippy or textured underside so it stays put on the sheet.
- Removable, washable cover. You will likely use it every night for months.
- Low odor. New foam can smell at first; air it out before use.
Heartburn and the bigger wedge
If heartburn keeps you up, there is a simple position change to ask about. For reflux in adults, NIDDK suggests raising your head 6 to 8 inches using a foam wedge or extra pillows under your head and upper back. A larger bed wedge can do that while you lie on your side. Check with your prenatal care team before treating ongoing heartburn on your own. If you also want to know about full-size bed wedges, see our wedge pillow for side sleepers guide.
After the baby arrives
Many parents keep their wedge for feeding support. Keep it out of the baby's sleep space. The U.S. Consumer Product Safety Commission says not to add pillows or positioners to a baby's sleep area, and that inclined products with an angle greater than 10 degrees should never be used for infant sleep.
What to look for when you buy
Small firm memory foam bump wedge
Best for: Side sleepers who want light belly support without a bulky pillow
A compact, firm wedge supports the bump in the side-lying position clinicians recommend from 28 weeks, and moves easily if you switch sides.
Watch out: Supports one spot only; it will not stop you rolling onto your back by itself.
See options on AmazonTwo-piece wedge set (bump and back)
Best for: People who keep waking up on their back
One wedge supports the belly while the second sits behind your back as a stop, helping you stay on your side.
Watch out: Two pieces can drift apart during the night.
See options on AmazonLarge bed wedge for reflux
Best for: Nighttime heartburn in later pregnancy
NIDDK describes raising the head 6 to 8 inches with a foam wedge for reflux, and a bed wedge does this while you stay on your side.
Watch out: Takes up the head of the bed; you may still need a small pillow for your bump.
See options on AmazonC-shaped or U-shaped full body pillow
Best for: People who want back, bump and knee support in one piece
Surrounds you on both sides, combining the back stop and knee support a single wedge cannot give.
Watch out: Takes up a lot of bed space, and it is warmer than a small wedge.
See options on AmazonQuestions people ask
- When should I start using a pregnancy wedge?
- Whenever it helps you feel comfortable. The CMAJ review advises avoiding going to sleep on your back from 28 weeks, so many people start using one by the third trimester.
- Where do you put a pregnancy wedge pillow?
- Most people tuck it under the bump while lying on their side. It can also go behind your back or between your knees.
- What if I wake up on my back?
- Simply turn back onto your side. The advice focuses on the position you go to sleep in, and a wedge behind your back can make rolling less likely.
- Is a wedge better than a full pregnancy pillow?
- Neither is required. A small trial found regular pillows and pregnancy pillows equally effective at reducing back sleeping, so choose based on comfort and bed space.
Sources
- Sleeping posture in pregnancy (cmaj.ca), CMAJ (Canadian Medical Association Journal)
- Side Sleeping: Which Side Should You Sleep On? (www.sleepfoundation.org/sleeping-positions/side-sleeping), Sleep Foundation
- Treatment for GER and GERD (niddk.nih.gov), NIH / NIDDK
- Safe Sleep: Cribs and Infant Products (cpsc.gov), U.S. Consumer Product Safety Commission