How Long Are Cats Pregnant?

What happens in the first 3 weeks?

Fertilization and implantation occur during the first two weeks, with the embryos attaching to the uterine wall around day 12 to 14. External signs are minimal during this period; some cats experience brief morning sickness (decreased appetite, occasional vomiting) around week 2 to 3. The nipples may begin to enlarge and turn a darker pink color around day 15 to 18, a change called "pinking up," which is one of the earliest visible signs. Behavioral changes are subtle: some cats become slightly more affectionate or quieter than usual.

What changes in weeks 3 through 6?

The embryos develop rapidly during this period. By week 4, a vet can confirm pregnancy through palpation or ultrasound. The abdomen begins to enlarge noticeably around week 5. Appetite increases significantly as the developing kittens demand more resources. The cat may start seeking out quieter, more secluded resting spots. This is the period to transition to a higher-calorie diet; many vets recommend kitten food for pregnant cats because it provides the extra protein and calories needed. Weight gain of 2 to 4 pounds total is typical by the end of this phase.

What happens in the final 3 weeks?

The kittens grow rapidly and may be visible moving beneath the abdominal wall. The mother's appetite may decrease in the final week as the kittens crowd the stomach. Nesting behavior intensifies: the cat will actively seek out and prepare a birth location, often choosing dark, enclosed, quiet spaces. The mammary glands enlarge and may produce milk in the final days. The cat's body temperature drops slightly (below 100 degrees Fahrenheit) approximately 24 hours before labor begins. X-rays are reliable after day 45 for counting kittens and confirming fetal size.

How should you prepare?

Set up a whelping area (a large box with low sides lined with clean towels) in a quiet, warm location by week 7. Provide the mother with free access to high-quality food and fresh water. Keep a vet's emergency contact number readily available since complications, while uncommon, require immediate professional help. Signs of trouble include labor lasting more than 24 hours without kittens, more than 2 hours of active straining without delivering a kitten, green or bloody discharge without a kitten following within 30 minutes, or the mother appearing severely distressed or lethargic. Most cats deliver without complications, but knowing the warning signs is essential.