* Breed: Some breeds, like Persians and Maine Coons, tend to have larger litters.
* Age of the mother cat: Younger cats may have larger litters than older cats.
* Number of previous litters: Cats who have had more litters may have smaller litters.
* Health and nutrition: A healthy, well-nourished mother cat is more likely to have a larger litter.
It's important to note that a single litter can range from 1 to 10 kittens, but anything outside of the 3-4 average is considered unusual.