How to Make a Cat Birthing Box
A cat birthing box is a quiet, enclosed space lined with soft bedding where a pregnant cat delivers and nurses her kittens. Set it up in a low-traffic room at least two weeks before her due date, using a box taller than she is long with one low side for easy entry.
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In practice, cats often pick their own spot days before labor if you offer a few good options early. A laundry room, closet, or quiet corner of a bedroom usually works better than a loud kitchen or hallway. Expect her to reject the first box you set out at least once — that's normal, not a sign you did something wrong.
Some owners search for this under different names: nesting box, whelping box, or queening box. They all describe the same thing — a den-like space for a pregnant cat to give birth and settle in with her litter.
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The 30-Second Nesting Check
Before you build anything, look for the behavior that tells you labor is close. Walk through the house and watch for these signs over the next day or two.
- Restlessness, pacing, or repeated trips to small, hidden spots
- Loss of interest in food in the final day or two
- Frequent, gentle licking of her belly and hindquarters
- Low vocalizing or purring that sounds different from her usual purr
- A drop in energy followed by a burst of nesting activity — scratching at blankets, digging in closets
If you see two or more of these together, move the box into its final spot now and keep the room quiet.
Step 1: Choose the Right Box and Size
Pick a box several inches taller than your cat is long, measured nose to tail. She needs enough room to stretch out, turn around, and later let several kittens nurse at once without climbing over the sides.
Cut or fold down one side so it sits a few inches lower than the rest. That gives her an easy way in and out without having to jump. It matters most in the days right after delivery, when she won't want to leave the kittens for long.
| Option | Pros | Cons | Best for |
|---|---|---|---|
| Sturdy cardboard box | Free, easy to replace once soiled, disposable after use | Can lose shape if bedding gets wet; may not hold up through a large litter | A first litter, or a short-term setup |
| Plastic storage tote | Wipes clean, holds its shape, blocks drafts | Smooth sides are harder for a kitten to climb once mobile; needs one side cut down | Reusing across more than one litter |
| Commercial whelping or queening box | Built-in low entry side; some models add a guard rail that helps stop crushing | Costs more than a repurposed box; you still provide the bedding | Breeders or anyone planning multiple litters |
Step 2: Line It With Safe, Washable Bedding
Clean towels, old fleece blankets, or puppy training pads layered under a towel all work well. Washable fabric lets you swap in a fresh layer fast once kittens start arriving, without tearing apart the whole nest.
Skip cedar or pine shavings — their oils can irritate newborn kittens. Also skip loose string, yarn, or anything with a drawstring. Tiny claws and umbilical cords can both catch on it.
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Step 3: Put the Box in a Low-Traffic, Consistent Spot
Once you pick a location, don't move the box again unless she's already rejected it. A consistent, dim, draft-free corner helps her settle instead of searching the house for somewhere quieter. Keep it away from other pets, loud appliances, and foot traffic.
If you haven't finished a full safety pass on the rest of the house, do that around the same time. Our room-by-room cat-proofing checklist covers the hazards newborn kittens find fastest once they start exploring.
Step 4: Introduce the Box Early and Let Her Choose
Set the box out one to two weeks before her due date, with the bedding already inside. Let her sniff it, nap in it, and treat it as a normal piece of furniture. Don't force her in — a cat that chooses the spot herself is far less likely to abandon it mid-labor.
If she keeps returning to a different corner instead, move the box there rather than fighting her preference. The right location matters more than which box you bought.
Step 5: Prepare for Delivery Day
Keep a stack of clean, dry towels nearby. Also have your vet's phone number and the nearest emergency animal hospital's number written down somewhere obvious. Most queens deliver without any help from you, but you should still know who to call if something looks wrong.
Watch for a long gap between kittens with visible straining, heavy bleeding, or a kitten stuck partway out. Any of those is a reason to call your vet right away rather than wait and see.
Some queens growl, hiss, or let out long yowls as contractions get stronger. Those are the same stress vocalizations PetTalk — Pet Translator (the App Store listing name for Cat Translator) is built to decode. It turns a recorded meow, growl, or yowl into a plain-English read in a few seconds, right on your phone, with nothing uploaded. It's free and runs on iOS 16 or newer. It's a fun way to check in on how she's doing between contractions — not a substitute for your vet.
Once kittens arrive, you'll likely need at least one trip to the vet for checkups. If your queen fights the carrier, check our guide on how to get a cat in a carrier without a fight. It covers a calmer way to load her in.
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Frequently Asked Questions
How soon before labor should I set up a cat birthing box?
Set the box up at least one to two weeks before her due date. That gives your cat time to find it, sleep in it, and treat it as her own spot. It won't feel like a strange new object on delivery day. If you wait until labor starts, she may ignore it and choose a closet or a drawer instead.
What bedding is safe for a cat giving birth?
Clean towels, old fleece blankets, or puppy training pads layered under a towel all work well. Avoid cedar or pine shavings, since their oils can irritate newborn kittens. Also skip loose string, yarn, or anything with a drawstring that paws or tiny claws could catch on. Keep a dry, clean spare layer ready to swap in after delivery.
Can I use a cardboard box for a cat to give birth in?
Yes, a plain cardboard box works for many cats. Just make sure it's tall enough that she can't jump out and one side is cut low enough for easy entry. Line it well, since cardboard can soften if it gets wet. Keep a backup box ready in case the first one needs replacing partway through.
Should I stay with my cat while she's in labor?
Stay nearby, but let her lead. Cats tend to labor more calmly with light supervision from a distance rather than being handled directly. Check in quietly every so often, and step in only if you notice signs of trouble. That includes a kitten stuck partway out or a long gap between kittens with visible straining.
How do I know my cat is in labor?
Look for restlessness, frequent nest-digging, heavy panting, and repeated trips to her birthing box in the hours before delivery. Some cats also vocalize more than usual, with low growls, soft yowls, or purring that sounds tenser than their normal purr. Contractions and visible straining mean kittens are likely close.
What if my cat won't use the birthing box I made?
Move the box to wherever she's already trying to nest, even if that's a closet shelf or under a bed. Don't force her back to your original spot. Cats usually settle once the box sits in a location they already picked on their own. If she still resists it completely, let her deliver where she's comfortable and move the litter together once she's done.
