Kittens typically stop growing and reach their full size by the time they are around 12 months old. However, the exact timeline can vary depending on the breed, genetics, and individual development. Here's a general breakdown:
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0–6 months: This is the most rapid growth phase. Kittens grow quickly in size and weight during this time.
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6–12 months: Growth slows down, but kittens continue to fill out and develop muscle mass. By around 9–12 months, most kittens are close to their adult size.
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12+ months: Some larger breeds, like Maine Coons or Ragdolls, may continue to grow until they are 2–4 years old, as these breeds mature more slowly.
While kittens may reach their full size by 12 months, they may continue to gain muscle and fill out slightly beyond this age. Proper nutrition, regular veterinary care, and a healthy environment all contribute to healthy growth and development. If you're unsure about your kitten's growth or have concerns, consult your veterinarian.