Keeping numbers down! I love all cats, but they deserve a good home, and if too many are allowed to breed, there will be far too many kittens (and soon adults) to home. We are inundated with kittens much of the time. Remember, a female can become fertile as early as 6 months, so needs to be sterilised as early as possible. I once adopted a cat who had had kittens very young, when she was still really only a baby herself.