Pregnancy in Cats

How long is a cat pregnant?

The gestation period for a cat is 63-65 days (approximately nine weeks). This varies between cat though, and anywhere between 60 to 70 days is average.

A pregnant cat is known as a queen, an entire male is known as a ‘tom‘, and the male who sires the litter of kittens is known as a stud.

What age can a cat become pregnant?

A kitten can come into heat as young as four months of age. Signs that your cat is in heat can include the following:

  • Persistent vocalisation
  • If she is stroked, she may lay her front half low, raise her hindquarters, treading up and down with her hind feet, and move her tail from side to side. This is known as lordosis
  • Licking the genitals

Some breeds such as Siamese and Orientals tend to be a little more precocious than other cats. A pregnancy in a cat this young is extremely dangerous as she has not reached maturity herself.

Do littermates mate?

Yes, cats are not fussy about who they mate with. Littermates can and will breed; fathers will mate with their daughters and mothers will mate with their sons. It is also possible for a female cat to become pregnant to more than one father.

Signs of pregnancy

It is not possible to determine a pregnancy via a blood or urine test in cats. However, there are often indicators that your cat is pregnant. The pet owner may notice weight gain around the fourth week of pregnancy. Increased appetite is common as the pregnancy advances and the cat’s calorie intake will increase.

Below is a timeline that covers both kitten development and changes that will occur in the queen during the duration of her pregnancy.

Cat pregnancy timeline

Week 1 (0 – 7 days)

  • Kittens: 20-24 hours after mating, the zygote, consisting of two cells forms. 4 – 6 days after mating, the ball (morulae) consists of approximately 30 cells. Around five days after copulation, the morulae enter the uterine horn. By ten days, some blastocysts have hatched.
  • Mother: There are no visible signs of pregnancy in your cat.

Week 2 (8 – 14 days)

  • Kittens: Implantation occurs 12-13 days after ovulation.
  • Mother: Palpitation of the uterus is possible as early as an experienced veterinarian may feel day 15, round 1cm swellings within the uterus.

Week 3 (15 – 21 days)

  • Kittens: An ultrasound can detect the pregnancy, and the fetal heartbeat is visible. By 21 days the unborn kittens are between 1.2 and 2.5 cm. The fetal heartbeat can be detected around 22 days.
  • Mother: The queen’s nipples will become pink and enlarged, which is known as ‘pinking up’. Some cats will develop morning sickness by the third week of pregnancy.

Week 4 (22 – 28 days)

  • Kittens: The embryo is now a fetus. The eyes and limbs are forming; the toes on the forelimbs are starting to separate. Your veterinarian will be able to feel individual fetuses as discrete masses at this stage.
  • Mother: By the fourth week of pregnancy, she should have gained enough weight to make her pregnancy visible.

Week 5 (29 – 35 days)

  • Kittens: The fetus is now approximately 58mm long from crown to rump. The limbs continue to grow; the claws and paw pads are now prominent. It will be challenging to feel individual kittens by 35 days.
  • Mother: You may notice some behavioural changes in your cat; she may become more affectionate as her pregnancy progresses.

Week 6 (36 – 42 days)

  • Kittens: The bones of the fetuses have mineralised by 40-45 days and are visible on an x-ray. The ear flaps, tail and genitalia are now visible. The claws are well developed.
  • Mother – The mother is obviously pregnant.

Week 7 (43 – 49 days)

  • Kittens – The hair follicles are beginning to develop. The skin is becoming thicker, and the hair follicles are starting to sprout hair.
  • Mother – By this stage, the mother is quite large and becoming uncomfortable. You should be able to see and feel the kittens moving around at this stage.

Week 8 (50 – 56 days)

  • Kittens – By 56 days, the crown-rump length is 121 mm (4.76 inches). Pigmented hair now covers the body of the unborn kittens.
  • Mother – The mother is still growing in size; she will be slowing down now due to discomfort. She may have toileting accidents.

Week 9 (57 – 63 days)

  • Kitten – By 60 days the kitten is approximately 145 mm (5.7 inches) long from crown to rump.
  • Mother – The queen may show signs of nesting; her behaviour may change. Some can become quite clingy with their family; others prefer to be alone. She may start to produce milk.

Confirming the pregnancy

An experienced veterinarian will be able to palpitate the abdomen and feel the kittens around 17 – 25 days. Do NOT attempt to do this at home as you may cause miscarriage or damage to the developing kittens. After 32 days the developing fetuses and fetal membranes become difficult to distinguish.

The fetal bone structure is visible on x-rays around the 43rd day. Avoid x-rays in early pregnancy.

Ultrasound can also detect pregnancy in a cat.

Do cats get morning sickness?

Yes, cats can experience morning sickness. They may also go off their food around the third week of pregnancy.

Special requirements

Your cat should be up to date on her vaccinations before falling pregnant and be on a regular flea and worming regime.

Keep her indoors for the last two weeks of pregnancy to ensure she doesn’t give birth to the kittens elsewhere.

You should take your queen to the veterinarian early in pregnancy for a health check; your veterinarian will also advise on the care of your queen during pregnancy. He/she will probably want to see the queen again in late pregnancy.

Feeding a pregnant cat

A good quality, nutritious diet is essential. Your veterinarian may recommend a kitten food for your queen as this contains higher protein and calcium. Avoid supplementing the diet unless your veterinarian has given the go-ahead to do so.

Avoid overfeeding, and excessive weight gain as this can complicate labour.

Provide free access to clean, fresh drinking water.


  • Kittening box which can either be a sturdy cardboard box or a commercially available kittening box.
  • Sterile surgical gloves.
  • Eyedropper or syringe to aspirate the mouth and nose secretions.
  • Dental floss or cotton thread to tie the umbilical cords.
  • Antiseptic to apply to the umbilical stumps.
  • Scissors.
  • Clean towels.
  • Your vet’s phone number in an easy to reach place.
  • An emergency vet’s phone number.
  • Kitten milk replacer.

How to prepare for the birth

During the last week of pregnancy, place the kittening box in a warm, quiet, draft-free room which is off-limits to children and other pets. She should be encouraged to sleep in this box.

Food, water, and a litter tray also need to be placed in this room.

Line the kittening box with old newspapers which can easily be changed or an old blanket. Make sure that the blanket isn’t going to snag the kitten’s claws. Change bedding daily.

Do not let the pregnant cat outside in the final week or two of pregnancy.

Signs of labour in cats

  • The mammary glands increase in size during the last week of gestation.
  • Around two days before the queen gives birth, she will start producing milk.
  • She may start nesting.
  • Drop in temperature to around 99 F.
  • Her appetite may wane in the last day or two of pregnancy.
  • Change in behaviour. During the last week or so your queen may become reclusive and seek out a secluded place, or she may become more affectionate, especially if she is bonded to one carer.

Danger signs:

Seek veterinary attention immediately if you notice the following:

  • Loss of appetite for more than 24 hours
  • Elevated temperature
  • Depression or lethargy
  • Discharge from the vagina

Can I give my cat medications while pregnant?

Some medications can cause congenital disabilities and or abortion in pregnant cats, so it is vital that you speak to your veterinarian before giving your cat any medications.

Can I worm my cat when she is pregnant?

Yes, but not all worming medications are safe for pregnant cats and her unborn kitten, so speak to your veterinarian about an appropriate de-wormer. Worm the queen as usual, and again at 5 and 7 weeks gestation.

Please see this page which lists worming medications which are safe to use on pregnant and lactating cats.

Can I treat my cat for fleas while she is pregnant?

I believe there are some flea products which are safe to use on pregnant cats. These are available from your veterinarian, so it is best to speak to him/her. DON’T ever use a flea product on a pregnant or nursing cat without the okay from your veterinarian.

Other things to avoid when a cat is pregnant

Be careful with antiseptics such as Dettol as many are toxic to cats and also burn the skin. If you need to use any antiseptics, use one recommended by your veterinarian.

Avoid excessive handling of the newborn kittens – let the mother bond with her babies. Cats have been known to kill and eat their babies if threatened by other animals or too much human interference.

Reminder – Female cats can again become pregnant within as little as 2 weeks after giving birth but more usually between 8 weeks and 10 weeks so great care that the queen is kept safely confined during this time.

If you plan to desex your cat, wait until kittens are 7 weeks old. The mother can still nurse her kittens afterwards.

Unplanned cat pregnancy

If this is an unplanned pregnancy are you prepared for the unexpected?

  • Difficulty giving birth, which will require an emergency c-section.
  • Death of the mother.
  • Death of the kittens.
  • Rejection of kittens, this will mean that the kittens will have to be hand raised for the first few weeks. Hand raising kittens is a rewarding but challenging job, which requires around the clock feeding for several weeks.

Your responsibility:

  • Have you found suitable homes for the kittens?
  • Microchipping is mandatory in some states in Australia, and all kittens must be microchipped before they go to their new homes. So please remember to factor this into your budget.
  • Vaccinate and worm kittens before they go to their new homes.

How soon after giving birth can a cat come into heat again?

It is possible for a cat to come into heat, mate and become pregnant between 6-8 weeks after giving birth.

Please remember that there is a huge problem with unwanted cats, and the shelters are overflowing with cats desperately in need of a good home, so don’t contribute to the overpopulation of cats unless you are a registered breeder.

Can a vet spay a pregnant cat?

It is possible to spay a pregnant cat, but this will lead to the loss of her unborn kittens. Some veterinarians may recommend waiting until after the queen has given birth, especially if she is far along in her pregnancy.

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  • Julia Wilson, 'Cat World' Founder

    Julia Wilson is the founder of Cat-World, and has researched and written over 1,000 articles about cats. She is a cat expert with over 20 years of experience writing about a wide range of cat topics, with a special interest in cat health, welfare and preventative care. Julia lives in Sydney with her family, four cats and two dogs. Full author bio

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