On average, an adult female cat goes into estrus once every four months. She can give birth to up to two litters a year and can give birth until she is 7 years old. Therefore, a female cat can give birth to 14 litters in her lifetime. However, it is not recommended for female cats to give birth too much or give birth frequently. It will shorten the life span of the female cat. It is best to control the number of litters to 8-10, which will help the female cat's physical recovery and the quality of the puppies will be better.