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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.
Newborn kittens can't regulate their body temperature, so during their first week they stay close to their mother, sleeping, feeding and relying on her for warmth. A new-born kitten weighs between three and five ounces (90-140 gm), and should gain weight at around half an ounce a day.