* Age of the mother cat: Younger cats tend to have larger litters than older cats.
* Individual cat's health: A healthy cat is more likely to have a larger litter than one with health issues.
* Breed: While Siamese cats are known for having multiple kittens, there's no set number.
* Number of previous litters: Cats that have had multiple litters before may have smaller litters later in life.
On average, Siamese cats can have litters ranging from 2 to 6 kittens.
It's important to note that it's not always easy to determine how many kittens a pregnant cat will have before she gives birth. However, a veterinarian can usually get a good estimate with an ultrasound.