C shape pregnancy pillow: head, back and knee support in one curve
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- Full-length C-shaped pregnancy pillow with zip cover. Best for: People who sleep mostly on one side in a full or queen bed. See options on Amazon
- C-shaped pillow with jersey or cooling cover. Best for: Warm sleepers. See options on Amazon
- Small foam wedge to add behind your back. Best for: C pillow users who still roll onto their back. See options on Amazon
- Contoured knee pillow. Best for: People who only need hip comfort and already like their head pillow. See options on Amazon
How the C shape is built to be used
The Sleep Foundation calls the C-shaped pillow one of the most versatile styles. It describes it as long, thin and curved, and says you can lay it out lengthwise as a full body pillow to cuddle while side sleeping, or fold it to support your stomach, back, knees or shoulders. It also notes the C is not very bulky.
That flexibility is the main reason to choose a C over a U. It covers the same three support points the NHS and Tommy's describe (bump, knees and back) in a shape that fits a smaller bed.
Two ways to lie in a C
| Setup | How it works | Best for |
|---|---|---|
| Back to the curve | The long side runs along your spine; the top curve holds your head; the bottom curve comes forward between your knees. | People who tend to roll onto their back. Tommy's suggests a pillow behind your back to help you stay on your side. |
| Facing the curve | You hug the long side; the bottom end goes between your knees and under your bump. | People who want belly and knee support and already have something behind them. |
Either way, your knees end up cushioned. The Sleep Foundation says a knee pillow helps keep your hips stacked and your spine aligned, and that in pregnancy it offers extra support to the hips and pelvis.
C or U: an honest comparison
- Space. The C is slimmer. The Sleep Foundation calls the U rather bulky.
- Turning over. The U supports both sides, so you roll inside it. With a C you either turn the pillow or face the other way and lose your back support.
- Back support. Only one side of a C can be behind you at a time. If rolling flat is your main worry, a U or a C plus a wedge behind you gives more security.
- Reuse. A C folds into a bolster for the back or knees, which makes it easier to keep using in other ways.
See the U-shaped pregnancy pillow guide for the other side of this choice.
What to check before you buy
- Length against your height. The top should sit under your head while the bottom reaches your knees. A pillow that is too short leaves your knees bare.
- Fill. The Sleep Foundation says polyester fiberfill is common in larger pregnancy pillows and tends to be softer, while foam is firmer and memory foam is the most likely to trap heat.
- Cover. It says most pregnancy pillows come with a removable cover you take off and wash, and that removable covers help if your washing machine is small.
- Head height. If the top curve is too low for your shoulder width, put your usual pillow on top of it.
Why side sleeping is the point
The NHS says the safest position to go to sleep is on your side, either left or right, and that after 28 weeks falling asleep on your back can double the risk of stillbirth. It also says not to worry if you wake on your back: just turn onto your side again. Tommy's adds that the advice applies to naps as well as night sleep. A C pillow set up behind you before you drift off is a simple way to follow that advice.
What to look for when you buy
Full-length C-shaped pregnancy pillow with zip cover
Best for: People who sleep mostly on one side in a full or queen bed
The Sleep Foundation calls the C one of the most versatile pregnancy pillow styles and notes it is not very bulky, so it gives head, back and knee support without filling the bed.
Watch out: You have to turn it, or lose back support, when you switch sides.
See options on AmazonC-shaped pillow with jersey or cooling cover
Best for: Warm sleepers
Fiberfill C pillows breathe better than dense foam, and a light cover adds airflow where the pillow touches your skin.
Watch out: Covers vary a lot in feel. Check the fabric listed, not just the word cooling.
See options on AmazonSmall foam wedge to add behind your back
Best for: C pillow users who still roll onto their back
Tommy's suggests a pillow behind your back to help you stay on your side. A wedge fills that gap when the C is in front of you.
Watch out: One more thing in the bed. Check it is firm enough not to squash flat.
See options on AmazonContoured knee pillow
Best for: People who only need hip comfort and already like their head pillow
The Sleep Foundation says a knee pillow keeps your hips stacked and offers extra hip and pelvis support in pregnancy.
Watch out: It does not support the bump or back.
See options on AmazonQuestions people ask
- How do you sleep with a C-shaped pregnancy pillow?
- Rest your head on the top curve, let the long side run along your back or front, and tuck the bottom curve between your knees. Turn it, or yourself, when you switch sides.
- Is a C-shaped pillow good for side sleepers?
- Yes. It is built for side sleeping, with head, back or belly, and knee support in one piece.
- Is a C or U pregnancy pillow better?
- A C takes less room and suits one-side sleepers. A U suits people who turn often because support is on both sides.
- Can I use a C-shaped pillow after pregnancy?
- Many people keep using it as a body pillow or fold it as a back or knee bolster. Keep it out of your baby's sleep space: Safe to Sleep advises nothing there but a fitted sheet.
Sources
- Best Pregnancy Pillows (www.sleepfoundation.org/best-pillows/best-pregnancy-pillow), Sleep Foundation
- Tiredness and sleep problems in pregnancy (nhs.uk), NHS
- Sleep On Side: a pregnancy campaign (tommys.org), Tommy's
- Sleeping With a Pillow Between Your Knees (www.sleepfoundation.org/best-pillows/sleeping-with-a-pillow-between-your-knees), Sleep Foundation
- Your baby's movements (nhs.uk), NHS
- Ways to Reduce Baby's Risk (safetosleep.nichd.nih.gov), Safe to Sleep, NICHD (NIH)