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Kittens typically reach a length and weight close to their full-grown size by 9 to 12 months of age. After the 1-year mark, most cats continue to grow at a much slower rate until at least 18 months of age. Large breeds, such as Maine coon cats, typically take even longer to grow to their full size. These cats may not be fully grown until they reach 2 to 4 years of age.
It usually births up to six kittens, very rarely a single one, and it is believed that the size of its litters reflect the high rate of mortality the infant cats can expect. Yet they are expected to be able to hunt at sixteen weeks and are very much on their own and independent by six months.