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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.
A female cat usually develops hormones around the age of six months and therefore is able to have kittens. However, at 6 months old, the cat is still a kitten herself, so lettâ¦ing her breed will severely endanger her and the unborn kittens lives, as both mother and litter need a lot of energy to grow and develop in a healthy manner.