The pregnancy period of a cat is calculated from the date of successful mating to delivery, which is generally about two months. However, the birth time of different breeds of cats is slightly different. Generally speaking, the gestation period of short-haired cats and domestic cats is 56-71 days, while the gestation period of long-haired cats and purebred cats is slightly longer, with an average of about 65 days. For different breeds of cats, the error should not exceed seven days.