Determining a kitten’s age isn’t hard, but it can require you to do a little detective work. Here’s how to figure out a kitten’s age from newborn to one year old.

By Doug Jimerson
October 27, 2020
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Knowing how old your kitten is can be important if you want to be sure you are providing your pet with age-appropriate care and nutrients. According to Carlene Strandell, Director and Founder of Smitten with Kittens, a non-profit, foster-based kitten rescue that operates in Tallahassee, Fla., you can tell the age of a kitten by looking at his eyes, ears, teeth, weight, and how he moves. “Some kittens will be older than their size and weight might suggest,” she says, so check other characteristics as well to determine age.

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Ears: Folded against head

Eyes: Closed 

Teeth: Toothless; While nothing beats milk from mama cat, if she isn’t in the picture, he may need you to step in to bottle feed him with formula (learn more about that here).

Movement: Slight wiggling

Weight: 3 to 7 ounces

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Ears: Will begin to unfold

Eyes: Start to open from 7 to 10 days; eyesight is unfocused

Movement: Start to crawl at about 7 days

Weight: 5 to 10 ounces

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Ears: Erect

Eyes: Will be open, although they won’t be able to dilate. All kittens will have blue eyes at this age. 

Movement: Kittens will snuggle together

Weight: 8 to 14 ounces

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Ears: A kitten’s ear canals will be completely open and the animal may startle with loud noises.

Teeth: Incisors begin to show

Movement: They walk with purpose

Weight: 10 ounces to 1.1 pounds

RELATED: Signs Your Kitten Is Teething and What to Do

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Teeth: Canine teeth and premolars start to show

Movement: Kittens begin to play with each other. Self-grooming also begins at this age. Weaning starts at this age as kittens begin to eat solid food.

Weight: 12 ounces to 2 pounds

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Eyes: Change from blue to their permanent adult color

Teeth: All baby teeth are now in place and your pet will be eating solid food almost completely.

Weight: 1 to 2 pounds

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By this age, your kitten should look like a miniature version of an adult cat.

Weight: 1.4 pounds to 2 pounds

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Teeth: Once your kitten is between three and four months old, adult teeth will start to push out the baby teeth. By the time he’s six to seven months old, all of his adult teeth should be in place. 

Weight: Until he’s five months old, most kittens gain one pound every month. Therefore, a four-pound kitten is probably four months old. Until they are 12 months old, kittens eat solid food designed for their growing needs.

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At this age, your kitten is considered an adult cat because he will be fully grown and have a full set of adult teeth. Your cat may gain some additional weight as he grows older, but at this time he should be fed adult cat food.

RELATED: Just How Often Should I Be Feeding My Cat?