What age does a cat have to be to have kittens?

Well, cats can go into heat at 5-7 months. A cat becoming pregnant at this age is incredibly dangerous, as it is still a growing and developing kitten. The risk of the mother and kittens not surviving is quite high, which is one of the reasons it is ideal to spay her before she has her first heat.

My cat, Timbit, got pregnant at 7 months and gave birth when she was 9 months. This is really too young for a cat to give birth. My vet said it is like a teen pregnancy. She had 3 kittens, but only one survived. Since she was so young, one died at birth, and one was stuck so the vet had to take it out. It was already dead inside her. Cats are usually considered "adults" at one year of age, as they have stopped growing and developing, which is the safest earliest age for a cat to become pregnant.