Kitten Age Chart: How to Tell How Old Your Kitten Is
A kitten's age is easiest to pin down with three checks: eyes and ears, teeth, and weight. Eyes open between 7 and 10 days old. All 26 baby teeth are usually in by about 8 weeks. Most kittens gain close to a pound a month through 4 months old. No single sign nails the exact week. Together, they narrow a guess down fast.
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If you've taken in a stray, a foster, or a kitten from an untracked litter, you're guessing from scratch. That's normal. Shelters and rescues make this same call every day. They use the physical checkpoints below instead of a birth certificate.
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The 30-Second Kitten Age Check
Before working through each method, run a quick scan. It won't give you an exact week. It sorts a kitten into a rough age band in under a minute.
- Eyes: still closed, just opening, or fully open?
- Ears: flat against the head, or standing up?
- Teeth: none visible yet, a few small points, or a full set?
- Movement: crawling only, wobbly on her feet, or running and pouncing?
- Weight: lighter than a soda can, about a pound, or several pounds?
Three or more answers pointing to the same stage put her in a tight range fast. Open eyes, standing ears, and a full set of baby teeth together mean 6 to 8 weeks old — often before you even reach for a scale.
Method 1: Check the Eyes and Ears First
Newborn kittens are born with their eyes sealed shut. Their ears start out folded flat too. Eyes begin opening between 7 and 10 days old, usually both around the same time. One eye opening a day or two before the other is common.
True eye color isn't set yet at that point. Every kitten's eyes look blue-grey at first. The adult color starts to settle in around 6 to 8 weeks. Ears follow a similar timeline. They begin unfolding and lifting around 2 to 3 weeks, and stand fully upright by about 3 weeks old.
If the eyes are still closed, the kitten is younger than 10 days old. She needs her mother or round-the-clock bottle feeding, not solid food.
Method 2: Read the Kitten Teeth Age Chart
Teeth are one of the more reliable markers. They erupt in a fixed order, regardless of breed. The first baby incisors break through around 2 to 3 weeks old. Baby canines and premolars follow over the next few weeks.
By 6 to 8 weeks, most kittens have their full set of 26 baby teeth. Nothing changes again until around 3 to 4 months. That's when baby teeth start falling out, and permanent adult teeth push in behind them.
The full adult set of 30 teeth is usually in by 6 to 7 months. Vets can read this sequence with a quick look in the mouth. That's part of why a first checkup often narrows down a rescued kitten's age better than a guess at home.
Method 3: Use a Kitten Weight Chart by Age
Weight is the roughest of the three methods on its own. Litter size, breed, and health all shift it. Paired with the eyes, ears, and teeth checks, though, it confirms or rules out a guess fast.
Newborn kittens typically weigh 3 to 4 ounces, or 90 to 110 grams. Expect roughly a pound of weight gain per month through 4 months old, as a common rule of thumb. Growth then slows toward adult size by 10 to 12 months.
| Age | Approx. weight | Note |
|---|---|---|
| Birth | 3–4 oz (90–110 g) | Weigh on a kitchen scale, not a bathroom scale |
| 4 weeks (1 month) | About 1 lb (450 g) | Eyes open, first teeth in |
| 8 weeks (2 months) | About 2 lb (900 g) | Common adoption age |
| 12 weeks (3 months) | About 3 lb (1.4 kg) | Fully weaned onto solid food |
| 16 weeks (4 months) | About 4 lb (1.8 kg) | Adult teeth starting to come in |
| 6 months | Roughly 5–7 lb, breed-dependent | Growth slows from here |
| 12 months | Adult weight for most breeds | Maine Coons and a few large breeds keep growing longer |
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Method 4: Watch Mobility, Weaning, and Litter Habits
Behavior fills in the gaps between the physical markers. Crawling and sleeping all day signals a kitten under 2 weeks old. Wobbly first steps show up around 3 weeks. Real running, pouncing, and play start around 4 to 5 weeks.
Weaning onto solid food usually begins around 4 weeks. It wraps up by 8 to 10 weeks. Litter box use tends to start as soon as a kitten can walk steadily, often around 3 to 4 weeks. If she's already using one on her own, she's at least that old.
Kitten Age Chart at a Glance
| Age | Eyes & ears | Teeth | Mobility |
|---|---|---|---|
| Birth to 1 week | Eyes closed, ears flat | None yet | Crawls only, sleeps most of the day |
| 1 to 2 weeks | Eyes opening (7–10 days) | None yet | Starts pushing up on front legs |
| 2 to 3 weeks | Eyes open, ears unfolding | First baby teeth appear | Wobbly first steps |
| 3 to 4 weeks | Ears fully upright | More baby teeth in | Walking steadily; litter box use often starts |
| 4 to 5 weeks | Eyes still blue-grey | Canines and premolars in | Running, pouncing, real play begins |
| 6 to 8 weeks | Adult eye color settling in | Full set of 26 baby teeth | Mostly weaned onto solid food |
| 3 to 4 months | — | Baby teeth start falling out | Longer legs, more coordinated jumps |
| 6 to 7 months | — | Full set of 30 adult teeth | Approaching adult proportions |
Why Getting the Age Right Also Helps Day to Day
Getting the age right shapes real decisions. It affects vaccine timing, the switch from kitten food to kibble, and when spay or neuter surgery becomes an option. It's worth narrowing down before you lock in a feeding or vet schedule.
It also changes how you read her sounds. Young kittens' chirps, mews, and early purrs don't mean the same thing as an adult cat's. The iOS app Cat Translator — listed on the App Store as PetTalk — Pet Translator — lets you create a cat profile with her age and breed. Its interpretations then adjust for a kitten instead of an adult. If you'd rather not download anything yet, this site's free cat sound decoder walks through the same sound categories right in the browser.
Other milestones follow once you've settled on an age band. Litter habits often need adjusting as a kitten grows. Our guide on how often to change cat litter covers a schedule that scales with her size. If she's joining a household with another cat, how to introduce cats to each other covers the first few weeks of that introduction. For a kitten born into a tracked litter, the clock starts even earlier — see how long cats are pregnant for the birth date this whole chart counts from.
When a Vet Visit Beats Guesswork
Home checks get you close, not exact. Vets can confirm an age estimate three ways: a closer dental exam, a weigh-in on a calibrated scale, and a general health check. That check also catches issues like parasites, common in very young kittens.
This matters most for a kitten younger than 8 weeks. Vaccine timing and weaning schedules depend on getting the age roughly right. If you adopted or found a kitten without papers, book a first vet visit before you lock in a long-term feeding plan. ASPCA's kitten care overview is a reasonable starting point for what that visit typically covers, alongside direct answers from your own vet.
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Frequently Asked Questions
How can you tell how old a kitten is?
Check her eyes, teeth, and weight together — each develops on a fairly fixed timeline. Closed eyes mean she's under 10 days old. Having a full set of 26 baby teeth points to roughly 6 to 8 weeks. Weight close to a pound suggests around 4 weeks. Matching two or three of these signs gives a tighter estimate than any single one alone.
How old is my kitten based on her weight?
Kittens gain close to a pound a month for their first 4 months, as a rough guide. They start from a birth weight of about 3 to 4 ounces. One weighing around 2 pounds is usually close to 8 weeks old, and one near 4 pounds is closer to 4 months old. Breed, litter size, and health all shift this, so pair it with the eye, ear, and teeth checks above.
What is a kitten teeth age chart?
A kitten teeth age chart maps which teeth are present to a rough age. Kittens grow teeth in the same order, regardless of breed. Baby incisors appear around 2 to 3 weeks. The full set of 26 baby teeth is in by 6 to 8 weeks. Permanent teeth start replacing them around 3 to 4 months. By 6 to 7 months, most kittens have their full adult set of 30 teeth.
At what age do kittens open their eyes?
Most kittens open their eyes between 7 and 10 days old, often one eye slightly before the other. Eyes stay a blue-grey color at first. True adult eye color settles in around 6 to 8 weeks. Closed eyes put a kitten younger than about 10 days old. She still needs her mother or bottle feeding.
How often does a kitten need to see the vet?
Young kittens typically need several vet visits in their first few months, for vaccines and a general check. The exact spacing depends on the vaccine brand, local disease risk, and her age at the first visit. Your vet's office sets the specific schedule rather than a single fixed number. It's worth calling and booking that first appointment as soon as you can.
Can an app tell you how old a kitten is?
Not reliably — age estimation depends on a hands-on look at her eyes, teeth, and weight. No app can check those through a phone screen or microphone. What an app like Cat Translator can do is adjust its sound readings once you've entered her age yourself. Her chirps and mews then get interpreted differently than an adult cat's growls or yowls.
