The number of female cats’ initial birth is about 2-5, and then the number will increase between 3-8. The cat’s belly will be obviously swollen on the 30th day of pregnancy, and it can be checked by going to the pet hospital on the 45th day. How many kittens are pregnant. Cats will give birth in about 60-65 days after successful pregnancy after mating. During this period, the breeder must supplement the cat's nutrients and prepare the birthing nest and urine pad before giving birth.