Relvay makes a pregnancy pillow. We also tell you below when you should not buy one.
The short answer
Match the cover to your pillow's model and measurements, not just the U shape. Write down three things before you shop, then compare every listing against them.
- Model: the exact name on the pillow's tag or order.
- Seams: outer length, width, arm gap and thickness in inches.
- Closure: where the zipper runs and how long it is.
How do you find a replacement cover that fits your U pillow?
Make a fit sheet from your own pillow first, then shop. A cover sold for your exact model is the safest bet. A generic cover is a guess you check against your numbers.
- Find the model name. Look for a sewn tag on the pillow itself, or your old order email. Brands often sell several U pillows with different sizes under similar names.
- Take the old cover off and lay the pillow flat. Measure the bare pillow, not the cover, because covers stretch and shrink.
- Measure along the seams. Outer length from the top of the curve to the end of an arm. Outer width across both arms. The gap between the arms. The thickness of one arm.
- Note the closure. Where the zipper runs (outer curve, inner curve, one arm) and roughly how long it is. A short zipper on a long pillow makes dressing it a wrestling match.
- Shop with the sheet open. Compare each listing's stated size to your numbers. If a listing gives no measurements, skip it.
Why does a cover sold for U pillows still not fit?
Because U is a shape, not a size. Lengths, widths and arm gaps vary between pillows, so a cover cut for one can be too short, too loose or twisted on another.
9:30 p.m.
I was 33 weeks and the cover on my U pillow had finally given up. The seams were coming apart at the bend and the fabric had gone thin where my bump rested. I found a cheap U cover online that said it fit most pillows and ordered it that night.
When it came, I spent twenty minutes on the bedroom floor trying to stuff the pillow in. One arm went in. The other arm stopped four inches short. The bend sat in the wrong place, so the zipper pulled tight across the curve like it was about to split. My partner held one end while I tugged the other, and we both ended up laughing, and then I was not laughing.
I had never measured my pillow. I had matched the word U and nothing else.
"quickly loosened seams"Amazon review of a pregnancy pillow
A cover that almost fits wears out fast. Your measurements are the only way to know.
Your replacement cover fit sheet
Fill in the left column once, keep it on your phone, and check every cover against it.
| Write down | Where to find it | Why it matters |
|---|---|---|
| Brand and model name | Tag on the pillow, order email | Model-specific covers are cut for that pillow. |
| Outer length, inches | Tape along the outer seam, top of curve to arm end | Too short and an arm sticks out or the zipper strains. |
| Outer width, inches | Across both arms at the widest point | Too narrow and the arms squeeze together. |
| Arm gap, inches | Inside, between the arms | Decides where the bend of the cover sits. |
| Arm thickness, inches | Around one arm, or its height lying flat | A tight tube flattens the filling. |
| Zipper position and length | Old cover | Changes how easy it is to get the pillow in and out. |
U covers we looked at in US listings ranged from roughly 50 to 59 inches long and 28 to 31.5 inches wide. That spread is exactly why the word universal needs your numbers next to it.
Is a universal pregnancy pillow cover worth trying?
Only if its stated full size is close to your measurements and the seller takes returns. Universal is a claim, and makers themselves are careful about it.
Babymoov's replacement cover for its B.Love XXL is listed for that reference only, not for its other pillow designs. Doomoo's Comfy Big cover page says its Buddy, Softy and Comfy Big pillows differ in size and features and limits that cover to Comfy Big. If brands will not promise a cover fits their own other pillows, a generic cover cannot promise it fits yours.
- The listing gives measurements, not just "fits most".
- Length and width are close to your sheet.
- The zipper is long enough to open most of the curve.
- The seller states a return window for covers.
What should you do when the new cover arrives?
Try it on dry, before you wash it, and keep the tags and packaging until you know it fits. A washed cover is often harder to return.
- Open the zipper fully and feed in the bend of the pillow first, then each arm.
- Check the seams line up with the pillow's edges and the bend sits at the bend.
- Close the zipper without pulling hard. If it strains, it is too small.
- Lie on it for a few minutes. Bunched fabric under your bump will bother you at 3 a.m.
Then wash it the way its label says. Our guide on washing a pregnancy pillow covers cover and core separately, and if a cover that used to fit suddenly does not after a wash, see cover no longer fits after washing.
Frequently asked questions
Are pregnancy pillow covers universal?
No. U is a shape, not a size. Lengths, widths and arm gaps vary, and some makers limit their own replacement covers to one model. Compare any cover's stated size to your pillow's measurements.
How do I measure my pregnancy pillow for a new cover?
Take the old cover off, lay the pillow flat and measure the outer length, the width across both arms, the gap between the arms and the thickness of one arm, in inches.
Can I use a cover that is slightly bigger?
A little extra room is easier to live with than too little, but a loose cover can bunch and shift under you. Too small strains the zipper and seams and squashes the filling.
Should I wash a new cover before trying it on?
Try it on dry first and keep the tags until you know it fits. Then wash it the way its own label says.
Where the Relvay 3-Piece pillow fits in
Relvay does not sell replacement U covers, so we cannot sell you the cover this guide is about. If you love your U pillow, buy a model-matched cover and keep it. If the worn-out cover has you asking whether you want a U at all, our 3-Piece set is the closest thing we make: two small wedges with a removable, washable cover.
Two wedges for bump and back, joined by a flat strap, about as wide as your torso. Keep a regular pillow between your knees. $79.99, 90-day returns.
Grace's story is a composite based on real reviews and public posts from pregnant side sleepers. Names and details are changed.
