Feline Fact: When Do Cats Stop Growing?

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At What Age Do Cats Stop Growing? A Comprehensive Guide

Wondering when cats stop growing? That makes two or more of us. While some cats may continue to grow slower, most cats reach their maximum size at around 18 months of age. But the answer to this question can vary depending on your cat’s breed.

Cats typically stop growing between 1 to 2 years old, but there are fascinating nuances in their growth journey! Some breeds may take longer to reach their full size, while others may stop growing earlier.

 Please keep reading to learn more about the different stages of a cat’s life and when they stop growing.

Cat Growth Stages

When Do Cats Stop Growing? - We Love Cats and Kittens in 2023 | Kittens, Cat health, Cats
Cat growth stages


Kittenhood is the first stage of a cat’s life, lasting from birth until around one year of age. During this time, kittens experience rapid growth, gaining weight and developing their bodies astonishingly. At birth, kittens weigh only around 50 grams (2 ounces).

However, by three months, they typically weigh around 1kg (2.2 lbs) and can reach over 2kg (4.4 lbs) by six months of age.

By one year, most cats are more or less fully grown, although some cats may continue to grow slowly until they reach 18 months or even up to 4 years old.

During kittenhood, kittens also go through important developmental stages, such as the growth of baby teeth and the replacement of these teeth with adult teeth.

Kittens also go through sexual maturation between four and nine months of age, which can lead to behavioral changes and the onset of reproductive abilities.


Once a cat reaches adulthood, they are fully developed and no longer experience the rapid growth of kittenhood. However, cats still go through important life stages during adulthood, such as maintaining their physical and mental health.

During adulthood, cats require a balanced diet to maintain their health and prevent obesity. They also require regular exercise and mental stimulation to stay active and engaged.

Additionally, cats may experience changes in behavior and health as they age, such as decreased mobility or the onset of age-related diseases.

Cats, as they mature, eventually reach their full size, becoming elegant and independent feline companions with unique personalities and characteristics.

By recognizing each growth stage’s unique needs and characteristics, cat owners can help their feline companions live long, healthy, and happy lives.

At What Age Do Cats Stop Growing?

Average Age

According to various sources, most cats, or animals with paws, stop growing at around one-year-old. At 18 months, cats are equivalent to 21-year-old humans in terms of physical maturity.

Signs of Maturity

As animals with paws, adult cats tend to be calmer and less playful than kittens, and they also tend to be more independent and less demanding of attention.


While most cats stop growing at one year old, some exceptions exist. Some breeds, such as Maine Coons, take longer to reach their full size and may continue to grow until they are 2-3 years old. Other cats may continue to grow if they are underfed or have health issues that affect their growth.

Overall, it is important to monitor your cat’s growth and consult a veterinarian if you have any concerns about its size or development.

Factors Affecting Your Cats Growth

When do cats stop growing?
When do cats stop growing


Different breeds of cats have different growth rates and sizes. For example, the Maine Coon is one of the largest domesticated cat breeds and can take up to four years to reach their full size.

On the other hand, the Siamese breed is known for being small and slender, and they usually reach their full size at around 12 months of age. Researching your cat’s breed is important to know what to expect regarding growth rate and size.


Nutrition plays a vital role in the growth and development of cats. A well-balanced diet that includes ary nutrients, vitamins, and minerals is essential for healthy growth.

Kittens require more protein than adult cats, and it is important to feed them kitten-specific food until they reach their full size.

According to Dr. Jim Carlson, proprietor of the Riverside Animal Clinic, cat owners can feed their cats three times a day from six months to a year.

Most cats will do fine on a diet of two meals per day after a year, but some may do better on more frequent, smaller meals.


Health issues can affect a cat’s growth rate and size. Any underlying health conditions, such as thyroid problems or malnutrition, can lead to stunted growth. Regular visits to the vet can help identify any health issues that may be affecting your cat’s growth.


The environment in which a cat lives can also affect its growth. A cat that lives in a stressful environment may experience stunted growth due to the release of stress hormones.

On the other hand, a cat that lives in a comfortable and stress-free environment may experience healthy growth.

Providing your cat with a safe and comfortable environment can promote healthy growth and development. It is important to consider these factors to ensure your cat grows healthy and strong.

Bottom Line

After reading this complete guide, you should now have a better understanding of when cats stop growing. While there is no one-size-fits-all answer, most cats stop growing at around 18 months old, although some cats may continue to grow at a slower pace after this age.

It’s important to remember that growth rates can vary depending on the breed of cat, their nutrition, and overall health. As a cat owner, you must receive proper nutrition and veterinary care to support healthy growth and development.

If you’re unsure when your cat will stop growing or have concerns about their growth rate, it’s always best to consult your veterinarian. They can provide personalized advice and guidance to ensure your cat is healthy and thriving.

Remember, every cat is unique, and there’s no one right answer to when cats stop growing. Providing your cat with proper care and attention ensures they reach their full potential and live a happy, healthy life.


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