True. The average size of a cat's litter is four, though the number of kittens can vary from one to twelve.
The size of a cat's litter is determined by the breed and age of the mother. Generally, younger cats will have smaller litters, while older cats may have larger litters. Some cats may also have larger litters if they have access to plenty of food and a comfortable environment. The size of a litter can also be affected by the presence of other cats in the mother's environment.