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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.
General Guidelines. In general, a kitten is considered an adult cat when it reaches 1 year of age, but your cat may not actually be fully grown at this point. Kittens typically reach a length and weight close to their full-grown size by 9 to 12 months of age.witch your kitten from kitten food to adult cat food at about 12 months of age. You may need to feed your cat less food per day after the first year, especially if you had your kitten neutered or spayed. If you notice your cat developing a pudgy belly, cut back on the amount of food you feed her.