Which body pillow is right for how you sleep?

Updated October 7, 2026.

Most adults spend more of the night on their side than in any other position. In a Danish study that tracked working adults with body-worn sensors, participants spent more than half of their time in bed in the side position (Skarpsno et al.). A body pillow suits that position. It gives your arms something to hold and your top knee somewhere to rest.

Short answer: Most people do well with a 20 by 54 inch body pillow (Walmart) and a washable cover. 69% of Americans say they usually sleep on their sides (SSRS), and a body pillow is made for side sleeping. Choose fiberfill if you want light and simple, or shredded foam if you want to adjust the height. If you're pregnant, use it to stay off your back from 28 weeks (CMAJ). Keep it out of any baby's sleep space.

This guide is for: people who sleep on their side, people in the second half of pregnancy, and anyone comparing body pillows sold in the United States.

Key Takeaways

1. The common US size is 20 by 54 inches. All 5 seller pages we read listed it, so standard cases will fit (Walmart).
2. From 28 weeks of pregnancy, the advice is not to fall asleep on your back. A body pillow is one simple way to stay on your side (CMAJ).
3. Only 1 of 5 product pages we read gave a fill weight: 38 oz (Walmart). You may need to ask the seller before you buy.

On This Page

What is a body pillow and how big is a standard one?

A body pillow is one long pillow you hug or lie against. In the US most share one standard size, and most cases are cut to fit it.

A body pillow is a single long pillow, usually a straight rectangle, that runs from about your shoulders to your knees. You can hug it, tuck it between your legs, or lean back against it. Our page on what a body pillow is covers the shapes in more detail.

Nearly all inserts share one standard size. Walmart's Mainstays listing is a typical example (Walmart). Cases are cut to match (Amazon, DOWNSTORIA). Every insert page we read for this guide listed that size too. That makes shopping simple.

You can buy longer ones. A goose down and feather version also comes in a longer size (Walmart, Pillowtex), and the Sleep Foundation describes a longer model it tested (Sleep Foundation). Length matters less than you might think. When you curl up, the pillow just needs to reach from your chest to your knees.

Cases are the catch. If you buy an unusual length, finding a cover can be hard. Some covers are cut a little wider, which gives a thick fill more room. Before you choose a size, check that you can buy a spare cover for it. It saves a return.

Who gets the most out of a body pillow?

Side sleepers get the most use from one, and most American adults sleep on their side. Pregnant people and habitual huggers come next.

In a national survey, most Americans said they usually sleep on their sides, and far fewer said their backs or stomachs (SSRS). That's a lot of potential users. The side-sleeping preference also grows with age and body weight, according to the Danish sensor study (Skarpsno et al.).

Three groups get the most from one. People who sleep on their side use it to support the top arm and knee. Pregnant people use it to stay off their backs in late pregnancy. People who like holding something often settle faster at night.

If you mostly sleep on your back or stomach, a body pillow will mostly take up space. Try a rolled blanket along your side for a week first. It costs nothing. You'll soon see whether you reach for it.

The table below is our own judgement, based on the sources in this guide. No maker publishes it.

Does a body pillow help side sleepers with hip and back pain?

It can make lying on your side more comfortable, but we found no trial testing a plain body pillow for hip or back pain. Treat it as comfort.

In short, nobody has tested this well. Pillow research is almost all about the pillow under your head. Even there, the evidence is thin. A study of pillow height sums up the field: whether contour pillows ease neck pain or improve sleep better than ordinary pillows is still disputed, and the evidence so far is not enough to settle it (study on pillow height, PMC). We found no trial of a standard body pillow for hip or low back pain.

That leaves reasoning you can check against your own body. When you lie on your side, your top leg tends to slide forward and down. That drop twists your pelvis and pulls on your lower back. A pillow between your knees keeps the top leg level, so your hips stay stacked. A body pillow does the same job. It also holds up your top arm, which takes weight off the shoulder.

The trouble is that people move in their sleep. Sleepers in the Danish study changed position again and again through the night (Skarpsno et al.), so a small knee pillow often ends up on the floor. A long pillow you're hugging is harder to lose.

If pain wakes you most nights, see a clinician. A pillow is a comfort aid. It can't tell you why your hip hurts, and it shouldn't stand in for someone who can.

Should you use a body pillow during pregnancy?

It is a practical way to stay on your side. In late pregnancy, guidance is to avoid going to sleep on your back, and either side is fine.

In late pregnancy, the advice is about the position you fall asleep in. A clinical summary reports that going to sleep on the back, compared with the left side, was linked to a higher risk of stillbirth. It advises patients in late pregnancy to avoid going to sleep on their backs. It adds that the right side appears to be as safe as the left (CMAJ).

Earlier in pregnancy, the evidence is more reassuring. An NIH-funded analysis found that sleeping on the back or side earlier in pregnancy did not appear to raise the risk of stillbirth, reduced size at birth, or high blood pressure disorders (NICHD). The researchers cautioned that the study says nothing about late pregnancy.

The pillow helps with falling asleep in the right position. If you fall asleep on your back, you spend about half the night that way on average, according to the same summary. A body pillow along your back makes that first roll harder. You'll still wake on your back sometimes. When you do, turn onto either side and settle again.

Researchers have tested a pillow-like device designed to reduce back sleeping in late pregnancy (BJOG). That shows they take the idea seriously. It doesn't prove that any product you can buy works, though. Ask your midwife or obstetrician what they suggest for your pregnancy.

Which fill should you choose for a body pillow?

Polyester fiberfill is light and common, shredded foam lets you change the height, and down alternative is soft. Pick for washing first.

The fill decides how the pillow feels, how it washes, and whether you can change how thick it is. Product pages often call that thickness "loft"; this guide says height.

Polyester fiberfill is the usual default. One Walmart pillow names polyester fiberfill and gives its weight (Walmart). Shredded memory foam lets you adjust the height. Coop says its body pillows are adjustable so you can make them soft and fluffy, or firm (Amazon, Coop Home Goods). Down alternative aims for a squeezable feel. The Sleep Foundation describes one fill made of down alternative clusters derived from recycled plastic bottles (Sleep Foundation). Feather and down is less common. It is soft and easy to shape, but ask how to wash it.

For more side-by-side notes, see our compared page. Decide how you'll wash it first, then pick the feel. A pillow you can't clean won't stay pleasant for long.

What do body pillow product pages state, and what do they leave out?

Every page we read gave the size. Only one of five gave the fill weight, which is the figure that tells you how full the pillow is.

We read five seller product pages for body pillow inserts in the common size on 23 September 2026 and counted what each one said about its fill. This counts what the pages claim and nothing more. The pages fell into three buckets:

• 1 of 5 named its fill and gave a weight: 38 ounces of polyester fiberfill.
• 3 of 5 named the fill material but gave no weight.
• 1 of 5 left the fill unclear. It described only how the filling feels.

When we read it, the Yalamila feature list mentioned only "fluffy support filling". On 7 October 2026 it said only that the pillow is generously filled. The size was the one thing all five agreed on. Everything else varied from page to page.

Fill weight is the nearest thing a listing gives you to how full the pillow is. Two pillows the same size can feel very different. If the page doesn't say, ask the seller. Listings change, so treat this count as a snapshot.

How do you wash and care for a body pillow?

Read the listing before you buy, since some inserts are spot clean only. A washable cover in the common size protects the rest.

Check the care instructions before you buy. Listings disagree on washing. The Mainstays pillow is designed for spot cleaning only, with a damp cloth (Walmart). One Utopia Bedding listing recommends spot cleaning or hand washing (Amazon, Utopia Bedding). If a page says nothing about washing, ask before you buy.

A cover catches most dirt. One case in the common size uses an inner flap instead of a zipper and can go in the washer and the dryer on low (Amazon). Wash the cover often and the insert rarely. Our care page gathers the washing rules sellers state.

New pillows often arrive vacuum packed. One seller recommends shaking and fluffing it after opening, or giving it time to expand fully. Another says its pillow expands fully within a day or two. A shredded foam seller suggests a short spell in the dryer on medium heat. Follow the directions for your own pillow. Heat suits some fills and not others.

Fluff it every few days, pushing the ends in toward the middle. If a fiberfill pillow stays flat and lumpy after fluffing, it has probably reached the end of its useful life.

When should you not use a body pillow?

Never put one in a baby's sleep space. Pediatric guidance says to keep pillows and other soft items out of an infant's crib or bassinet.

Never put a body pillow where a baby sleeps. The AAP says to keep loose blankets, pillows, stuffed toys, bumpers and other soft items out of the sleep space (AAP). Thousands of US infants die in sleep-related deaths each year, and soft bedding such as pillows is a risk factor that can be changed (CDC, via PMC).

This matters most in the months after birth, when your pregnancy pillow is probably still on the bed. If there's any chance you might fall asleep with your baby in your bed, make sure there are no pillows that could cover the baby's face, head and neck (HealthyChildren.org). A long pillow is exactly that kind of object. Don't use one as a barrier to keep a baby from rolling off an adult bed, either.

Some adults should also be careful. After hip surgery, follow your surgeon's rules on positioning, since they may want a particular support rather than a soft pillow. If turning over in bed is hard for you, a bulky pillow can get in the way when you try to move. For most other adults, a body pillow carries little risk. The main cost is bed space, so check that whoever shares it is happy with that.

Common questions

What size case fits a body pillow?

A case in the common US size fits most inserts. One case is sold cut to that size (Amazon, DOWNSTORIA). If your pillow is thick, a slightly wider case is looser.

Is a body pillow the same as a pregnancy pillow?

Not quite. A body pillow is usually one straight length. Pregnancy pillows are often U or C shaped. The Sleep Foundation describes one U-shaped model with extra padding for the lumbar region. A straight pillow works in pregnancy too.

Will a body pillow keep you off your back all night?

Not reliably. You'll move during the night whatever you hug. Falling asleep on your side still helps, because the position you fall asleep in shapes much of the night.

Why does a new body pillow look flat?

It was probably compressed for shipping. Give it a day or two and fluff it. If it still looks thin, check the listing for a fill weight.

Should you buy a longer body pillow if you are tall?

Maybe. The pillow needs to reach from your chest to your knees when you curl up. Before buying a long one, check that covers come in its size.

Where does a body pillow go in bed?

Along the front of your body, with your top arm and top knee resting on it. In late pregnancy, some people add a second pillow behind the back.