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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.
The weight of a newborn kitten varies based on his breed and the number of littermates he has, according to the American Society for the Prevention of Cruelty to Animals.After birth, a healthy kitten should gain weight daily; if yours is not, you should take him to the vet.y the time the kitten reaches around 6 months of age, he should be approximately half the size of an adult cat. The average adult domestic cat weighs between 8 and 10 pounds, according to the Association for Pet Obesity Prevention. This means your little guy should weigh around 4 to 5 pounds at 6 months old.