Kitten Growth Chart: From Birth to Adulthood

Kitten Growth Chart-Keeping-pet
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Did your cat just give birth to a kitten? Are you wondering why the eyes and ear canals of the newborn kitten are shut? Is there something wrong with your cat? Well, there is nothing to worry about. Taking a look at different kitten growth charts, you will find out that all kittens are born this way.

The first couple of months of a kitten’s life is a whirlwind of developmental changes. Kittens open their eyes and ear canals, change eye colors, develop teeth, and gradually get weaned off from nursing to eating solid cat food.  A lot is happening from kitten’s birth to reaching adulthood and it is hard for owners, even for responsible and caring ones, to keep track of everything.

With developmental changes, the nutritional needs of cats change every week. Therefore, in addition to keeping a kitten feeding chart, cat owners must maintain a kitten growth chart to monitor their kitten growth timeline.

Kitten Growth Chart

Newborn Kitten1.8 to 5.3 ounces
1 Week Old Kitten5.3 to 8.8 ounces
2 Week Old Kitten8.8 to 12.3 ounces
3 Week Old Kitten12.3 to 15.9 ounces
4 to 8 Week Old Kitten1.4 to 2 pounds
9 to 12 Week Old KittenAround 3 pounds
12 to 16-week old kittenAround 4 pounds
16 to 20 Week Old Kitten5 to 6 pounds
6 Months to Adulthood6 to 8 pounds

Newborn Kitten

A newborn kitten will have her eyes shut and ears folded. This helps her eyes to continue developing even after birth. Closed eyes also help them with their hypersensitivity to light. Newborns will also have no teeth or even gums. During this stage, kittens are completely helpless and dependent on their mothers for everything, from feeding to staying warm and for mobility. Around an hour or two after their birth, kittens will start nursing. The mama cats will initiate the nursing, helping her kittens to latch on and suckle.

Their umbilical cord will still be attached to their mother and will fall off on its own in 3 to 4 days. Their nose and paws will be pink-colored. If you find them sleeping often, that is okay—newborns sleep for most of the day. The average weight of a newborn kitten ranges from 1.8 ounces to 5.3 ounces.

Don’t have a scale to weigh the kitten? Check out this Digital Pet Scale Baby Scale

Premature Kitten

Many times, kittens come to this world at a premature stage. They are very weak and lower in weight than the average newborn kitten. With lower weight, premature kittens also have very small body sizes, and often, there is little to no fur on most of their body. These fragile kittens do not even have the energy to crawl to their mothers or even hold their heads up. Like a premature kitten, a runt kitten of the litter would also require some extra care. They will also need their pet owners to guide them to their mother’s nipples. You will have to maintain a runt kitten growth chart to closely monitor their weight gain.

premature kitten - kitten growth chart

1 Week Old Kitten

One-week-old kittens will be no more directly attached to their mothers with the umbilical cord, but their eyes will still be shut. Their ears will start unfolding around the 7th day of birth, and their eyes will slowly begin opening between 8 to 12 days. One eye might open more quickly than the other. But you should not intervene to help them open their eyes. It is best that kittens open their eyes themselves. During this stage, your kitten will have blue eyes but don’t get attached to the eye color of your kitten, as with age, it will transition into an adult eye color.

The one-week-old kitten must have doubled their birth weight. On average, one-week-old kittens should weigh between 5.3 and 8.8 ounces.

Do you know that baby kittens cannot urinate or defecate on their own, and mother cats consume the eliminated matter to keep their kittens clean?

Yes. Since one-week-old kittens won’t be able to urinate or defecate independently, they will need stimulation from their mothers. Anogenital grooming done by mother cats through licking stimulates bowel moments of baby kittens, helping them eliminate with ease. The mother cat then consumes whatever her baby kittens eliminate. This may sound weird, but it is crucial for the kitten’s health and cleanliness.

2 Week Old Kitten

At this stage, your kitten will have its eyes opened and ears fully unfolded. If they are not, you should consult your veterinarian. However, the kitten would still not have any teeth, and their claws would still be non-retraceable. Two-week-old kitten size should range between 8.8 to 12.3 ounces. Their eyes would still be blue and ear small and round.

With their eyes fully opened, baby kittens would also be able to easily locate their mother’s nipples and initiate nursing. But still, they will need the mother cat to cooperate and lie on her side. However, two-week-old kittens will still not be able to urinate and defecate on their own. You will still find mama cats licking their kittens, stimulating the process of elimination, and later cleaning them up.

If you have rescued or adopted an orphaned or abandoned kitten, you will have to play the role of the mama cat. You will have to feed her Kitten Milk Replacer (KMR) with a kitten feeder. You will also have to stimulate them to urinate and defecate and will also have to nurse them and clean them up. For stimulating the baby kitten to urinate, you should use a soft disposable cloth or tissue and rub it around their genitals until they are done urinating. Similarly, if you think the kitten needs to defecate, you should stimulate her bottoms until she has finished her business.

If you don’t have a litterbox yet, you can shop this highly rated kitten litterbox on Chewy.

Kittens have very sensitive skin and are at a greater risk of developing urine and fecal scald if not cleaned properly. Therefore, it is advised that you clean the kitten well with a soft wet cloth or a baby wipe. You should also have to take the newly adopted or rescued kitten to the vet as soon as possible to get an idea about her overall health and get her vaccinated for deadly feline diseases.

3 Week Old Kitten

At this age, kittens will still have blue eyes, but their round ears will begin to point upward. Your kittens will start to develop their sense of hearing at this stage. If you open your kitten’s mouth, you might find tiny teeth growing at the front of the mouth. By now, kittens might start urinating and defecating on their own, but mother cats will still be responsible for cleaning up their waste. On average, the size of a 3-week old kitten should vary between 12.3 to 15.9 ounces.

The tiny paws of a three-week-old kitten would become retraceable. If your baby kittens are healthy, they may start purring and exploring the nearby spaces. They will also start recognizing and playing with their littermates.

4 to 8 Week Old Kitten

Your cat would start developing canines during week 4 and premolars during week 5. By week 6, your kitten’s teeth will be nearing the final stage of early development. If you want her to develop healthy chewing, you might consider Petstages Dental Kitty Chew Wheel Catnip Cat Toy, a toy that encourages healthy chewing.

At this stage, the kitten would have fully developed its vision. However, its eye would still be blue. A 5-week old kitten would be initiating all the nursing herself but would require cooperation from her mother. By now, baby kittens will be urinating and defecating on their own in nearby places without any prior stimulation from their mothers. Baby kittens would also start grooming themselves, but mama cat would still be providing some grooming.

Kitten Growth Chart-Keeping-pet

With eyesight and hearing senses fully developed, a 6-week old kitten would start playing with its littermates and interacting with her mother. She will also start exploring short distances on her own, without any support from her mother. On average, a 6-week old kitten size should be 1.4 to 1.7 pounds. The weaning process will start during the sixth week; by then, mother cats would have to bring some fresh solid food for their kittens. A 7-week-old kitten will be fully weaned off and consuming more solid food. Her eyes color would start transitioning from blue to yellow.

If you are playing the role of a mama cat, this no added grain dry kitten food offers complete and balanced nutrition to kittens of all life stages.

By the age of 2 months, your kitten should be weighing around 2 pounds. At this age, you will notice the testicles of your male kitten descending into the scrotum, according to VCA hospital.

9 to 12 Week Old Kitten

For a kitten growth chart, the rule of thumb is that a kitten will grow around 1 pound per month on average during the first six months. Therefore, a 3-month-old kitten size should be around 3 pounds. At this stage, kittens would start eating all solid food. It would also start bonding with its caregivers. At the age of 3 months, your kitten would have developed all of its baby teeth, which will soon start falling out. Kittens would also have developed their adult eye color.

12 to 16 Week Old Kitten

This is an intense growth period for your kitten. You will need to provide for their increased nutritional needs. Their appetite will increase—you would notice that your kitten will always be hungry. A four-month-old kitten size should be around 4 pounds. If you cannot feel any testicles in your male kitten’s scrotum at this stage, you can assume that your kitten has a condition named cryptorchidism, in which male kittens fail to develop one or both testicles.

16 to 20 Week Old Kitten

During this stage, your kitten will start behaving like an adult cat. They will start growing independent from their mother, exploring near to medium-range distances, and playing with her other feline fellas. A 5-month-old kitten should weigh between 5 to 6 pounds. It is time to bring her some cat toys.

6 Months to Adulthood

By the age of 6 months, your kitten will be looking like a little adult, trying to emulate her mother and other adult cats around her. Your cat might seem to be gaining weight disproportionately, but you do not need to fret about that. With time, your cat would start growing its long thin legs. On average, a 6-month-old kitten should be around 6 to 8 pounds.

If the testicles of your male kitten are nowhere to be seen in his scrotum even at the age of six months, it means that your kitten has cryptorchidism. The testicles are retained in his abdomen or inguinal canal. There is a huge risk that retained testicles become cancerous. Therefore, cat owners are strongly advised to consult a vet and neuter their male kittens with cryptorchidism, provided that the vet suggests the same.

Your kitten will sexually mature between 4 to 9 months of age and be fully grown by 12 months. While most cats reach adulthood by the age of 12 months, others might need a little more time—14 months or even two years.

It is advised that if you are not planning on breeding your kitten, both male and female, you should get them fixed before they reach puberty. Different breeds of cats reach puberty at different ages; therefore, it is advised that you talk to your vet and decide what the optimal age to fix your cat is. Fixing improves the lifespan of your kitten by reducing the risk of developing many serious diseases.

Kitten Growth Chart

Use the above kitten growth chart to judge if your kitten is growing properly. Keep in mind that the above-discussed weights are average, and your kitten might be smaller or larger than the average, depending on its breed. But if your kitten appears to have a weight too lower or higher than the average weight, you need to immediately consult your vet to check if there is something wrong with your kitten.


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