# Cat Whelping Box: How to Set One Up for a Queen A cat whelping box is a quiet, draft-free nesting area where your pregnant queen can give birth and raise her kittens during the first few weeks of life. You want a box that is big enough for her to stretch out and nurse, but small enough that newborns cannot wander far from her warmth. Set it up at least one to two weeks before her due date so she has time to accept it as her own space. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Build or buy a box roughly 1.5 times your queen's length when she lies stretched out, with walls low enough for her to step over but high enough to contain kittens. - Add a low interior lip or "pig rail" a few inches up from the floor so she cannot accidentally smother a kitten against the wall. - Use soft, absorbent, disposable bedding you can change daily, such as clean towels or puppy pads covered with a washable fleece layer. - Place the box in a quiet, warm room away from foot traffic, other pets, and loud appliances, and keep the room temperature comfortable for newborns. - Expect parturition about 64 to 66 days after the luteinizing hormone surge triggered by copulation [1], though without ovulation timing the exact date is hard to predict. ## Cat Whelping Box Setup: Step-by-Step ### Step 1: Time the setup to her pregnancy Normal gestation in the queen runs about 64 to 66 days from the luteinizing hormone surge triggered by copulation [1]. If you did not track ovulation, you may not know the exact breeding date, and predicting the length of gestation without prior ovulation timing is difficult [1]. Because of that uncertainty, have the box ready by day 55 to 60 of pregnancy. A queen who suddenly decides to nest in your closet at 2 a.m. is much harder to manage than one who already likes her box. ### Step 2: Choose the right size and shape The box should let the queen lie fully stretched on her side while kittens nurse, with a little extra room for them to crawl. A good rule is about 1.5 times her body length in both directions. Walls should be roughly 8 to 12 inches high for most cats. If the walls are too tall, she may refuse to use the box. If they are too low, kittens can climb out once they get mobile around three to four weeks. A plastic storage bin, a sturdy cardboard box, or a wooden whelping box all work. Plastic and wood are easier to disinfect than cardboard. Whatever you choose, the floor must be solid and waterproof so fluids do not soak through. ### Step 3: Add a pig rail or safety lip A pig rail is a ledge running along the inside walls a few inches above the floor. It gives the queen something to brace against and creates a small gap where a kitten can avoid being pressed into the wall when she lies down. You can make one from a length of PVC pipe, a pool noodle, or a strip of wood attached to the walls. This single feature prevents many newborn deaths. ### Step 4: Layer the bedding correctly Use three layers. The bottom layer is a waterproof liner or puppy pad. The middle layer is an absorbent pad or towel. The top layer is soft fleece or a clean towel that kittens can grip with their tiny claws. Change soiled bedding immediately and wash reusable bedding in hot water with a pet-safe detergent. Do not use clumping cat litter anywhere near newborns, because kittens can ingest it. ### Step 5: Place the box in the right spot Put the box in a quiet room the queen already trusts. Keep it away from other pets, washing machines, televisions, and doors that slam. The area should be warm and free of drafts. If you have other cats or a dog, plan a slow, supervised introduction once the kittens are older. Our guide on [how to introduce a new kitten to a resident cat](/knowledge/veterinary-medicine/clinical-methods/how-to-introduce-a-new-kitten-to-a-resident-cat) walks through that process, and [how to introduce a new dog to your cat](/knowledge/veterinary-medicine/anxiety-and-behavior-support/introducing-dog-to-cat) covers the canine side. ### Step 6: Let her settle in Place the queen in the box several times a day during the last week of pregnancy. Pet her, talk softly, and leave a worn shirt with your scent in the box. Do not force her to stay. If she chooses a different spot, move the box there or block off her preferred hiding place. A queen who feels secure is less likely to move kittens or abandon the nest. ## Cat Whelping Box Ideas and DIY Options You do not need to buy an expensive commercial whelping box. Here are practical options that owners use. | Option | Cost | Pros | Cons | |---|---|---|---| | Plastic storage bin | Low | Easy to disinfect, waterproof, cheap | Walls may be too tall, needs ventilation holes | | Cardboard box | Very low | Free, easy to cut to size | Not waterproof, must be replaced | | Wooden whelping box | Medium | Sturdy, can add pig rail, lasts for years | Heavier, needs sealing against moisture | | Kiddie pool | Low | Round shape, easy to clean | Walls flex, kittens can climb out | | Commercial whelping box | High | Purpose-built with rails and doors | Expensive, may be sized for dogs | For a DIY cat whelping box, cut a doorway in one wall so the queen can enter and exit without jumping. Line the cut edge with tape or a strip of wood so it does not snag her fur. Add a pig rail, then layer bedding. If you use a cardboard box, reinforce the bottom with a plastic sheet or a shallow tray. ## Cat Weaning Box and the Transition Period Around three to four weeks, kittens start exploring and sampling solid food. This is when a cat weaning box becomes useful. A weaning box is a low-sided, easy-to-clean container where kittens can eat wet food without dragging it across your floor. Place it near the whelping box so the queen can supervise. Use shallow saucers, not deep bowls, so kittens do not dunk their noses. Offer warmed kitten gruel or wet kitten food several times a day, and keep fresh water available in a shallow dish. Clean the weaning box after every meal to prevent bacterial growth. ## Hygiene and Health Schedule | Timeframe | Task | |---|---| | Before birth | Disinfect box, wash bedding, set up in quiet room | | Daily during nursing | Change soiled bedding, check kittens for warmth and feeding | | Week 1 to 2 | Weigh kittens daily, keep room warm, limit handling | | Week 3 to 4 | Introduce weaning box, start offering soft food | | Week 4 to 6 | Increase solid food, monitor weight gain, socialize gently | | Week 6 to 8 | Veterinary check, vaccinations per your vet's plan, prepare for adoption | Wash your hands before and after handling kittens. Keep the box dry. Newborns cannot regulate their body temperature well, so a chilled kitten is an emergency. If the room is cool, use a heating pad set on low under one half of the box so kittens can move away from the heat if they get too warm. Never put a heating pad directly against their skin. ## Signs Something Is Wrong Call your veterinarian if you see any of these. - The queen has been straining for more than 30 minutes without producing a kitten. - More than two hours pass between kittens with no sign of another. - She has a kitten stuck in the birth canal. - She is bleeding heavily or has foul-smelling discharge. - She ignores the kittens, refuses to nurse, or acts painful when they try to nurse. - A kitten is cold, limp, crying constantly, or not gaining weight. - The queen has a fever, vomits repeatedly, or seems depressed. A difficult labor can affect maternal behavior and offspring survival in the first hours after birth [2]. If the queen is distressed, restless, or unable to settle, do not wait. Get veterinary help. ## Common Mistakes to Avoid - **Box too big.** Newborns crawl away from the heat source and chill. Keep the space snug. - **No pig rail.** This is the most common preventable cause of newborn death in the nest. - **Bedding that shifts.** Loose bedding can smother a kitten. Use flat, fitted layers. - **Too much traffic.** Visitors and other pets stress the queen and can trigger kitten moving or rejection. - **Clumping litter nearby.** Kittens investigate with their mouths and can ingest litter. - **Skipping daily weights.** A kitten that is not gaining weight is a kitten in trouble. - **Handling newborns too much in the first week.** Short, gentle checks are fine, but long cuddle sessions are not. ## Supplies That Matter for Health Keep these items on hand before the due date. - A digital kitchen scale for daily kitten weights - A thermometer for the queen - Clean towels and fleece bedding - Puppy pads or waterproof liners - A heating pad with a low setting - Kitten milk replacer and a small syringe in case the queen cannot nurse - Shallow food and water dishes for weaning - A notebook or app to track weights and feedings If you have multiple cats, a clean, low-stress litter setup matters too. Our article on the [best litter box for multiple cats](/knowledge/veterinary-medicine/clinical-methods/best-litter-box-for-multiple-cats-automatic) covers options that reduce competition and mess. ## Limitations and When to Contact a Veterinarian This guide gives general setup advice. Individual cases need a veterinarian who can examine your queen and kittens. Contact your veterinarian the same day if the queen has a temperature above normal, refuses food for more than 12 hours, has discharge that smells bad, or if any kitten is not nursing every one to two hours in the first days. Go to an emergency clinic now if the queen is straining hard with no kitten for 30 minutes, if she collapses, if she has heavy bleeding, or if a kitten is stuck and partially visible. Schedule a routine visit within 24 to 48 hours after birth for a wellness check on the queen and kittens, and again at six to eight weeks for kitten vaccinations and deworming. ## Frequently Asked Questions ### How big should a cat whelping box be? Aim for about 1.5 times your queen's stretched-out length in each direction. The walls should be low enough for her to step in and out comfortably but high enough to keep newborns contained. If you are unsure, size up slightly and add a pig rail so kittens have a safe edge. ### Can I use a cardboard box as a whelping box? Yes, a sturdy cardboard box works for a single litter if you line it with a waterproof layer. Cut a low doorway for the queen and add a pig rail. Replace the box if it gets wet or soiled, because cardboard cannot be disinfected properly. ### When should I set up the whelping box? Set it up at least one to two weeks before the expected due date. Gestation is about 64 to 66 days from the luteinizing hormone surge, but without ovulation timing the date is hard to pin down [1]. Early setup gives the queen time to accept the box as her nest. ### What temperature should the room be for newborn kittens? Newborns cannot regulate their own body temperature, so keep the room warm and draft-free. Use a heating pad on low under one half of the box so kittens can move toward or away from the heat. If a kitten feels cool to the touch, warm it slowly and call your veterinarian. ### How often should I clean the whelping box? Change soiled bedding immediately and do a full bedding swap at least once a day. Disinfect the box between litters and whenever it gets soiled with urine, feces, or birth fluids. Wash your hands before and after handling the queen and kittens to reduce the spread of infection. ## Related Articles - [How To Introduce A New Cat To Your Resident Cat](/knowledge/veterinary-medicine/clinical-methods/how-to-introduce-a-new-cat-to-your-resident-cat) - [How To Introduce A New Kitten To A Resident Cat](/knowledge/veterinary-medicine/clinical-methods/how-to-introduce-a-new-kitten-to-a-resident-cat) - [How To Introduce New Cat To Cat](/knowledge/veterinary-medicine/clinical-methods/how-to-introduce-new-cat-to-cat) - [How to Introduce a New Dog to Your Cat: Step-by-Step Guide](/knowledge/veterinary-medicine/anxiety-and-behavior-support/introducing-dog-to-cat) - [Best Litter Box For Multiple Cats Automatic](/knowledge/veterinary-medicine/clinical-methods/best-litter-box-for-multiple-cats-automatic) - [How To Introduce A New Cat](/knowledge/veterinary-medicine/clinical-methods/how-to-introduce-a-new-cat) ## References 1. [Whelping and Queening in Bitches and Queens - Management and Nutrition](https://www.merckvetmanual.com/management-and-nutrition/management-of-reproduction-dogs-and-cats/whelping-and-queening-in-bitches-and-queens). Merck Veterinary Manual. 2. [Factors influencing ease of whelping and its relationship with maternal behaviour and puppy perinatal mortality in commercially bred dogs](https://pubmed.ncbi.nlm.nih.gov/35461375/). Scientific reports, 2022. ## Further Reading - [Breeding Management of Queens - Management and Nutrition (Merck Veterinary Manual)](https://www.merckvetmanual.com/management-and-nutrition/management-of-reproduction-dogs-and-cats/breeding-management-of-queens) - [Merck Veterinary Manual: Cat Owners](https://www.merckvetmanual.com/cat-owners) - [Cornell Feline Health Center: Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)