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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.
Proper Weight Gain. A young kitten should gain approximately a quarter-ounce to a half-ounce each day until he reaches between 4 and 5 weeks old and is weaned onto solid foods. Within the first week, he should almost double his weight, according to the NYC Feral Cat Initiative.