Newborn female cats will enter early estrus between 5 and 8 months old. At this time, the female cat’s sexual organs have matured. When the female cat is 10 to 12 months old, she will go into estrus again, and she can mate at this time. After that, it goes into estrus every six months and twice a year. Female cats in estrus will bark, lose appetite, roll around, and actively approach dogs of the opposite sex. In addition, the estrus period will last 10-15 days.