How to Use a Pregnancy Pillow: 7 Sleep Positions by Trimester (U, C, J and Wedge)

You bought the pregnancy pillow, took it out of the bag, and now there’s a giant U (or C, or J) taking up half the bed. Which end goes where? Does it go between your knees or under your bump? And are you supposed to sleep inside it or on top of it?

This guide shows you exactly how to use a pregnancy pillow, with 7 illustrated sleep positions for every pillow shape (U, C, J, wedge and straight body pillows). You’ll also find what changes each trimester, when to start using a pregnancy pillow, the best setups for back pain, hip pain, sciatica, rib pain and heartburn, how to choose one, how to wash it, and a free printable sleep guide for your nightstand.

What is a pregnancy pillow (and what does it do)?

A pregnancy pillow is a long, shaped body pillow (usually U, C or J shaped, or a small wedge) that supports your body while you sleep on your side. As your bump grows, your belly pulls your spine forward, your top knee drops toward the mattress and twists your hips, and it gets harder to stay on your side all night. A pregnancy pillow does three jobs:

1. Supports your bump so it isn’t pulling on your back and the ligaments around your uterus.
2. Keeps your knees, hips and ankles in line, which takes pressure off your lower back and pelvis.
3. Keeps you on your side by giving you something to lean back against.

The benefits of a pregnancy pillow are mostly about comfort: many people find they wake up less to reposition and have less hip and back ache in the morning. It doesn’t treat any condition, but it makes the sleep position health experts recommend much easier to keep.

Why side sleeping matters during pregnancy

The American College of Obstetricians and Gynecologists (ACOG) says that sleeping on your side during the second and third trimesters may be best. Lying flat on your back later in pregnancy puts the weight of the uterus on your spine and can press on a major blood vessel, which may make you dizzy and reduce blood flow to the baby.

The NHS goes further for later pregnancy: research suggests that after 28 weeks, falling asleep on your back can double the risk of stillbirth, so the safest position to fall asleep in is on your side. The NHS also reassures that if you wake up on your back, you don’t need to worry: just turn over and go back to sleep on your side. A pregnancy pillow is one of the easiest ways to make side sleeping comfortable enough to stay there.

Left or right side? Both are fine for most people. Some guidance suggests falling asleep on your left side when it’s comfortable, especially after 28 weeks, and switching sides during the night can ease hip and pelvic pain. Ask your midwife or doctor if you have a specific condition.

Types of pregnancy pillows: U, C, J, wedge and more

How to use a pregnancy pillow: 7 sleep positions

Start from the same base every night: lie on your side, bend your knees a little (or bend your top knee more than your bottom one), and keep your head in line with your spine. Then add the pillow.

1. 1. How to use a U-shaped pregnancy pillow

   

   1. Put the curved end at the top of the bed and lie down in the middle of the U.
   2. Rest your head on the curve (add your usual pillow on top if you need more height).
   3. Hug the front arm of the U, tuck it under your bump and bring it between your knees and ankles.
   4. Lean back slightly into the back arm so you’re supported and can’t roll onto your back.
   5. To switch sides, just turn over: the U is the same on both sides.

   Best for: back pain, hip pain, people who change sides often and anyone who keeps waking up on their back.

2. 2. How to use a C-shaped pregnancy pillow

   

   1. Lay the C with the open side facing behind you.
   2. Rest your head on the top curve.
   3. Let your bump rest against (and slightly on) the long front side.
   4. Hook the bottom curve between your knees.
   5. To change sides, flip the pillow over so the open side is behind you again.

   Best for: head, bump and knee support when you don’t need back support; getting in and out of bed easily.

3. 3. How to use a J-shaped pregnancy pillow

   

   1. Put the hook of the J at the top under your head and neck.
   2. Hug the long straight part in front of you and let it rest under your bump.
   3. Bring the end between your knees and ankles.
   4. Add a regular pillow behind your back if you tend to roll.

   Best for: smaller beds, people who like to hug a pillow, and neck and shoulder support.

4. 4. Wedge under your bump (plus a pillow between your knees)

   

   1. Lie on your side and slide the wedge under your bump, with the slope facing your belly.
   2. Push it in until your bump feels lifted, not squashed.
   3. Put a regular pillow (or a second wedge) between your knees.
   4. Earlier in pregnancy, a folded towel under the bump works too.

   Best for: round ligament pain, a growing bump, travel and small budgets.

5. 5. Straight body pillow between your knees

   

   1. Lie on your side and hug the top of the pillow at chest height.
   2. Run it down in front of your bump and between your knees and ankles.
   3. Make sure your top knee and ankle are both supported, so your top leg is level with your hip.

   Best for: hip pain, pelvic girdle pain, sciatica and anyone who wants a simple, washable option.

6. 6. Pillow behind your back to stay on your side

   

   1. Lie on your side and place a long pillow lengthways behind you, from shoulders to hips.
   2. Tuck it in snugly so you can lean back into it slightly.
   3. Add a small pillow between your knees.
   4. If you wake up on your back, roll back onto your side; that’s normal.

   Best for: staying on your side in the third trimester, especially if you keep waking up on your back.

7. 7. Propped up with a wedge (heartburn, rib pain, breathlessness)

   

   1. Place a wedge (or 2 to 3 firm pillows) under your head, shoulders and upper back, not just your head.
   2. Lie back on the slope or turn onto your side on it.
   3. Keep a pillow under your knees or between them for comfort.

   Best for: heartburn and acid reflux, rib pain, a stuffy nose and feeling short of breath late in pregnancy.

How to sleep with a pregnancy pillow, trimester by trimester

Trimester weeks are approximate. If you’re carrying twins or have a medical condition, follow your care team’s advice about positions.

When to start using a pregnancy pillow

There’s no set week. Start when you’re uncomfortable or when you’re switching to side sleeping. For many people that’s somewhere in the second trimester, as the bump starts to show and back or hip pain begins. A good rule:

• When to get a pregnancy pillow: by about halfway through pregnancy, so you’re used to it before the third trimester.
• When it matters most: from 28 weeks, when the NHS advises going to sleep on your side.
• Earlier is fine: if you already have back pain, hip pain or trouble sleeping in the first trimester, start whenever it helps.

Best way to use a pregnancy pillow for back pain

ACOG calls backache one of the most common pregnancy problems, especially in the later months. For sleep, it recommends lying on your side with one or both knees bent, a pillow between your knees and another under your belly, or a full-length body pillow. For lower back pain:

1. Use a U-shaped pillow (position 1) or a wedge under the bump plus a pillow between the knees (position 4).
2. Make sure your top knee is level with your hip, not dropping toward the mattress.
3. Support your bump so it isn’t pulling forward.
4. If your mattress sags, a firmer surface can help some people.

Call your provider if back pain is severe, lasts more than two weeks, or comes with fever, burning when you pee or bleeding.

Pregnancy pillow for hip pain and pelvic pain

Hip pain often comes from the top leg pulling your pelvis out of line. NHS physiotherapists at Leeds Teaching Hospitals suggest lying on your side with a pillow between your knees and ankles, and one under your bump, alternating between your left and right sides, and keeping your knees together when you roll over in bed.

• Use a pillow long enough to reach your ankles (straight body pillow, U or J).
• Add a soft topper or a folded blanket under the hip you lie on if it’s sore.
• Roll over “like a log”: knees together, then turn your whole body at once.

If you have pelvic girdle pain (pain at the front or back of the pelvis), ask your midwife about a referral to a pelvic health physiotherapist.

Sciatica, round ligament pain and rib pain

Sciatica

Many people with sciatica feel better lying on their side with a pillow between the knees and ankles, often on the side that doesn’t hurt. A straight or U-shaped pillow works well. Sciatica in pregnancy should be checked by your provider, especially if you have numbness or weakness.

Round ligament pain

Round ligament pain is a sharp pull low on the sides of the bump, often when you move or turn over. Support the bump with a wedge or the front of a U or C pillow, and turn over slowly.

Rib pain

Later in pregnancy, the baby and uterus push up toward the ribs. Raising your upper body slightly (position 7) and switching sides often can make room and ease the pressure.

Pregnancy pillow for heartburn and acid reflux

The NHS says propping your head and shoulders up when you go to bed can stop stomach acid coming up while you sleep, and that sleeping on your left side can also help. A wedge under your upper body (position 7) works better than stacking pillows under your head alone, which can bend your neck. Eating your last meal a few hours before bed helps too.

Pregnancy pillows for side, back and stomach sleepers

• Side sleepers: any shape works; a U-shape gives the most support.
• Back sleepers: later in pregnancy, practice side sleeping and put a pillow behind your back so you stay there. If you need to lie on your back, NHS physiotherapists suggest being propped up so your shoulders are well above your hips.
• Stomach sleepers: lying face-down usually becomes uncomfortable as the bump grows. A “three-quarter” position (on your side, rolled slightly forward onto a pillow hugged in front) can feel similar.

How to choose a pregnancy pillow

Check the dimensions against your bed, look for a removable, machine-washable cover, and choose a firmness that holds its shape overnight. Some families use an FSA or HSA card for pregnancy pillows; check your plan’s rules.

Shop by type

• U-shaped pregnancy pillows: full-body support
• C-shaped pregnancy pillows: head, bump and knees
• J-shaped pregnancy pillows: smaller beds
• Pregnancy wedge pillows: under the bump or behind the back
• Bed wedge pillows: for heartburn and propping up
• Spare washable covers: so one is always clean

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Do you need a pregnancy pillow? Is it worth it?

You don’t need one. Regular pillows can do the same jobs: one between your knees, one under your bump and one behind your back. A pregnancy pillow is worth it if:

• Your pillows keep falling out of place during the night.
• You often wake up on your back.
• You have back, hip or pelvic pain.
• You’ll use it after the birth as back support while feeding.

If budget is tight, start with a wedge and the pillows you have. You can always add a full pillow later in the third trimester.

How to wash a pregnancy pillow

1. Check the care label. Most covers are machine-washable; many inserts are not.
2. Unzip and wash the cover on a gentle cycle, then air-dry or tumble on low.
3. Spot-clean the insert with mild soap and water, unless the label says it can be machine-washed.
4. Dry everything completely before putting it back together, so it doesn’t get musty.
5. Air it out in fresh air when you can, and fluff it daily so the filling stays even.

A spare cover means you never have a night without your pillow.

Using your pregnancy pillow after the baby arrives

Many parents keep using their pregnancy pillow after the birth for back support while feeding, or for their own sleep after a C-section. One important rule: a pregnancy pillow is for you, never for your baby. The U.S. Consumer Product Safety Commission warns that pillow-like products, including nursing pillows, are not designed for sleep and are not safe for sleep. Babies should always sleep on their backs on a firm, flat surface with nothing else in the crib.

Getting ready for a new baby with older children at home? Our guide to preparing kids for big changes like a new baby can help, and our family daily schedule has sample routines for busy weeks.

Frequently asked questions

How do you use a pregnancy pillow?

Lie on your side with your knees bent. Rest your head on the top of the pillow, tuck the front part under your bump, and put the bottom section between your knees and ankles. With a U-shaped pillow, lean back into the back section so you stay on your side.

How should I sleep with a pregnancy pillow?

Sleep on your side with your knees slightly bent, your bump supported and a section of the pillow between your knees and ankles so your hips stay level. In the third trimester, a pillow behind your back helps you stay on your side.

When should you start using a pregnancy pillow?

Start whenever you’re uncomfortable. Many people begin in the second trimester as the bump grows. It’s a good idea to have one by about halfway through pregnancy, since the NHS advises going to sleep on your side after 28 weeks.

Which side should I sleep on when pregnant?

Either side is generally fine. Some guidance suggests falling asleep on your left side when comfortable, especially after 28 weeks, and switching sides can ease hip and pelvic pain. Ask your provider if you have a specific condition.

What is the best pregnancy pillow for back pain?

A U-shaped pillow gives the most support for back pain because it supports your bump, your knees and your back at the same time. A wedge under the bump plus a pillow between the knees is a cheaper option.

How do I use a pregnancy pillow for hip pain?

Lie on your side with a pillow between your knees and ankles so your top leg stays level with your hip, support your bump, switch sides during the night and keep your knees together when you roll over.

What’s the difference between a U-shaped and a C-shaped pregnancy pillow?

A U-shaped pillow supports your front and back, so you can switch sides without moving it. A C-shaped pillow supports your head, bump and knees but is open at the back, so you flip it when you change sides.

Can a pregnancy pillow help with heartburn?

Yes. Using a wedge to raise your head and shoulders can help stop stomach acid coming up while you sleep, and the NHS notes that sleeping on your left side can also help.

Do I really need a pregnancy pillow?

No. Regular pillows between your knees, under your bump and behind your back can work. A pregnancy pillow is worth it if your pillows keep moving, you wake up on your back or you have back or hip pain.

How do you wash a pregnancy pillow?

Remove the cover and machine-wash it on a gentle cycle, following the care label. Spot-clean the insert unless the label says it’s machine-washable, and let everything dry completely before reassembling.

Is it okay if I wake up on my back?

Yes. It’s common to move during sleep. The NHS says not to worry if you wake up on your back; just turn onto your side and go back to sleep.

Sources

• American College of Obstetricians and Gynecologists (ACOG) — Can I sleep on my back when I’m pregnant?
• American College of Obstetricians and Gynecologists (ACOG) — Back pain during pregnancy
• NHS — Tiredness and sleep problems in pregnancy
• NHS — Indigestion and heartburn in pregnancy
• Leeds Teaching Hospitals NHS Trust, Pelvic Health Physiotherapy — Pelvic girdle pain and low back pain
• U.S. Consumer Product Safety Commission — Nursing pillows and pillow-like products are not safe for infant sleep