Discovering that your cat is pregnant can feel overwhelming, especially if it was unplanned. Feline pregnancy moves quickly — from conception to birth in roughly nine weeks — and knowing what signs to look for, how to support your cat through each stage, and when to call a vet can make an enormous difference for both mother and kittens. This guide walks you through everything you need to know, from the first subtle clues to the moment the last kitten arrives.

How Long Are Cats Pregnant?

Feline gestation typically lasts 63 to 65 days from conception, although anywhere from 58 to 70 days falls within the normal range. Because cats are induced ovulators — meaning ovulation is triggered by mating rather than occurring on a fixed cycle — pinning down an exact conception date can be tricky. If you know the approximate date of mating, you can count forward to estimate a due date, but always treat this as a rough guide rather than a precise deadline.

According to guidance from the ASPCA, a female cat (queen) can come into heat as early as four months of age and can cycle repeatedly throughout the breeding season, which in many climates runs from spring through autumn. This means an unspayed cat can produce multiple litters per year — one of the key reasons veterinarians recommend spaying before the first heat.

Early Signs of Pregnancy in Cats

The earliest physical signs of pregnancy usually appear around two to three weeks after conception:

• Pink, enlarged nipples ("pinking up"): Around 15–18 days post-conception, the nipples take on a rosy-pink colour and begin to swell. This is often the first visible clue, especially in first-time mothers.
• Morning sickness: Some queens experience a brief period of nausea and vomiting during weeks three to four. If vomiting is frequent or severe, contact your vet.
• Increased appetite: Once nausea passes, most pregnant cats become noticeably hungrier. Caloric needs rise steadily throughout pregnancy.
• Weight gain: Queens typically gain between 1–2 kg (2–4 lbs) over the course of pregnancy, most of it in the second half of gestation.
• Behavioural changes: Many pregnant cats become calmer, more affectionate, and seek out warm, quiet spots — early nesting behaviour.
• Abdominal enlargement: The belly becomes visibly rounded from around week five onward, and individual kittens may be felt (and eventually seen moving) in the final weeks.

A veterinarian can confirm pregnancy via ultrasound as early as day 16–25, or by gentle palpation from around day 28. X-rays, which reveal the number of kittens by showing their skeletons, are typically performed after day 45, as VCA Animal Hospitals explains in their clinical guidance on feline reproduction.

Week-by-Week Pregnancy Timeline

Weeks 1–2 (Days 1–14): Fertilised eggs travel to the uterus and implant. No outward signs are visible yet. Keep your cat's routine normal and avoid unnecessary stress or medications.

Weeks 3–4 (Days 15–28): Nipple pinking occurs. Mild nausea may appear and resolve. A vet visit for ultrasound confirmation and a health check is ideal during this window. Discuss deworming and flea treatment options that are safe during pregnancy.

Weeks 5–6 (Days 29–42): The abdomen begins to round noticeably. Appetite increases. Begin transitioning to a high-quality kitten food (see Nutrition section below) if you haven't already. Foetal movement may be felt by gentle touch from week six.

Weeks 7–8 (Days 43–56): The queen looks heavily pregnant. Activity levels often drop. Start preparing the kittening box. You may be able to see kittens moving under the skin. X-rays can now confirm litter size — useful for knowing when delivery is complete.

Week 9 and birth (Days 57–65+): Nesting behaviour intensifies. The queen seeks out secluded spots. In the 24–48 hours before birth, body temperature typically drops to below 37.8°C (100°F). Labour and delivery follow.

Nutrition During Pregnancy and Nursing

Proper nutrition is one of the most important things you can do for a pregnant cat. Veterinary nutritionists recommend switching from adult maintenance food to a high-quality kitten food from around week four of pregnancy. Kitten formulas are calorie-dense and higher in protein, fat, calcium, and phosphorus — nutrients in high demand during foetal development and lactation.

Feed your queen on a free-choice or multiple-small-meals basis rather than set portions, as her appetite will increase significantly, peaking during nursing. Fresh water should always be available. Avoid raw diets during pregnancy due to the risk of Toxoplasma gondii and other pathogens, as highlighted by research published through the National Institutes of Health.

Do not supplement with additional calcium unless directed by a vet — over-supplementation can actually impair uterine contractions during labour.

For a well-formulated kitten food that supports both pregnant queens and growing kittens, Zooplus carries a wide range of vet-approved wet kitten foods, including options from Royal Canin and Hill's Science Plan that are frequently recommended by veterinarians for gestating and nursing queens.

Preparing a Kittening Box

About two weeks before the due date, set up a kittening box — a warm, quiet, low-sided box lined with clean towels or disposable puppy pads. Place it in a secluded area away from household traffic and noise. Introduce your cat to it early so she considers it her territory rather than seeking out a wardrobe shelf or the back of a cupboard.

The box should be large enough for the queen to stretch out, but with sides low enough that she can step in and out easily once kittens are nursing. Keep the room temperature around 22–24°C (72–75°F); newborn kittens cannot regulate their own body temperature and are extremely vulnerable to cold in the first weeks of life.

Signs of Labour

As birth approaches, watch for these signs that labour is beginning:

• Restlessness, pacing, and repeatedly entering and leaving the kittening box
• Vocalisations (some queens are very vocal; others are silent)
• Refusing food in the final 12–24 hours
• Drop in rectal temperature below 37.8°C (100°F), typically 12–24 hours before delivery
• Visible abdominal contractions and straining
• A small amount of mucous or bloody discharge from the vulva

Labour in cats is divided into three stages: dilation of the cervix (which may last up to 36 hours in first-time mothers and involves no visible straining), active delivery of kittens, and expulsion of placentas. Most queens deliver one kitten every 30–60 minutes, though intervals of up to two hours between kittens can be normal if the queen is resting calmly.

What Happens During Birth

Each kitten is typically born within its amniotic sac, which the queen will tear open and the kitten's face will emerge. She will then chew through the umbilical cord and vigorously lick the kitten to stimulate breathing. This process is instinctive in most cats — your role is to observe quietly and intervene only if needed.

After each kitten, the queen should deliver a placenta. Keep count of placentas against the number of kittens — a retained placenta can cause serious infection. Queens often eat the placentas, which is normal behaviour, though eating too many may cause vomiting or diarrhoea.

As reported by The Guardian, most domestic cat births proceed without human intervention, and the best support you can offer is a calm, warm environment and an unobtrusive presence.

When to Call a Vet — Emergency Signs

Most feline births are uncomplicated, but contact your vet immediately if you observe any of the following:

• Active straining with no kitten delivered after 20–30 minutes
• More than 4 hours between kittens when you know more are inside
• Bright red or heavy bleeding
• The queen appears exhausted, collapsed, or in severe distress
• A kitten is partially delivered and stuck
• Foul-smelling green or black discharge before any kitten has been delivered
• A kitten fails to breathe after the sac is removed and vigorous rubbing

After the Birth: Spaying Your Cat

Once the kittens are weaned at approximately eight weeks, scheduling your queen for spaying is the responsible next step. Modern veterinary consensus — including guidance from the RSPCA — recommends spaying female cats at around 4–6 months of age before their first heat cycle, as this eliminates the risk of mammary tumours, pyometra (a life-threatening uterine infection), and unwanted pregnancy. Early spay at this age is safe and well-tolerated by cats — unlike the situation in some large dog breeds where timing is more nuanced, cats do not carry the same hormonal development concerns that make delayed spay beneficial in certain canine cases.

For nutritional support during the kittens' weaning transition, Zooplus offers a range of starter and weaning foods formulated for kittens from three to twelve weeks, making it easier to support the litter as they move from mother's milk to solid food.