Even kittens as young as four months old can become pregnant. If you think that your cat is pregnant take. How Long Does Take To Get Pregnant After Depo Provera Pets Cats Love Your Pet The best way to find out is to make an appointment with your vet. . Cats usually have their first season when they are still a kitten at around 4-12 months old. Your cats pregnancy will last about 9 weeks with the average length being 63-65 days. Mother cat not cleaning kittens. If on the other hand a pregnant one-year-old cat is considered to be 15 years old in human years another unproven estimate the comparative length of pregnancy jumps to 30 months. A litter of four orphaned kittens needed a mother. So a cat can have kittens when they are only 6 months old. Pregnancygiving birth can come with complications and looking after a litter of kittens is hard work expensive and time consuming certainly not. Volunteers united Mi...