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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.
Tracking Weight. You can use the growth chart to track your kitten's weight as she develops. She will put on weight rapidly during the first weeks of her life. At ten weeks, she will be about two pounds. Tracking her weight can alert you to possible internal parasite infections or other illnesses.