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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.
âNormal birth weight for kittens is approximately 3.5 to 4 ounces. The minimum weight gain expected for a kitten is approximately 0.5 oz. / day. By six weeks of age, kittens should weigh approximately one pound.â. âIf it is healthy, receiving adequate food and growing normally, it will gain an average of 4 oz per week until it is 6 months old.â.