Kitten Age Chart

How to use this kitten age chart

1. Start with the teeth. Lift the lip gently and look. Teeth are the single most reliable sign, and on their own they usually narrow the age to a two-week window. A kitten with bare gums is under three weeks; tiny front teeth mean two to four weeks; a full set of small, sharp, slightly translucent teeth means six weeks or more.
2. Add whatever else you can see. Eyes, ears, umbilical cord and movement each add their own window, and the estimate is the overlap of all of them. Every sign you add tightens it — you don't need all five.
3. Weigh it if you can. Any kitchen scale works. Weight is the least reliable sign on its own, so the tool treats it as a cross-check rather than an answer.
4. Read the estimate and the confidence. The big number is the best single guess, the range underneath is the honest window, and the confidence tells you whether to trust it. There is no calculate button — it updates as you go.
5. Watch for the disagreement notice. If the signs point to different ages, the tool says so and names the odd one out instead of quietly averaging them. That notice is usually the most useful thing on the page.
6. Take the care plan with you. Every result comes with the feeding, warmth and toileting a kitten that age actually needs. Download the PDF care sheet for the fridge, or share a link that reopens the estimate exactly as you left it.

Why this kitten age chart is different

Every kitten age chart on the internet runs the wrong way. They publish the forward table — "at four weeks a kitten looks like this" — and leave you to run it backwards in your head while holding a squirming animal. Two of the best-known are literally photo posters. Here is what this one does instead:

• It runs the inference for you. You describe what you see; it returns the age. That is the actual question, and no other page on this topic answers it directly.
• It combines every sign at once. Teeth, eyes, ears, cord, movement and weight are intersected into a single window. Every other chart makes you check one axis at a time and reconcile them yourself.
• It tells you when your signs disagree — and which one to distrust. This is the part that matters most in real rescue situations and the part no static chart can do. An underfed kitten weighs like a younger kitten for weeks while its teeth erupt right on schedule. The tool detects the contradiction, resolves it in favour of the developmental signs, and tells you the kitten is probably underweight for its age.
• It refuses to guess when it shouldn't. A full adult set of teeth means "six months or older", not "six months" — a four-year-old cat has identical dentition. The tool says adult and sends you to the cat age chart rather than inventing a number.
• It answers "so what?" Every estimate comes with the feeding schedule, the warmth requirement and the next health milestone for that exact age, because "about five weeks old" is only useful if you know what a five-week-old needs.
• It shows its work and it's embeddable. Every signal's age window and source is printed below, a fixture test runs on every build, and rescues and foster networks can drop the whole thing onto their own site free.

How to tell a kitten's age, sign by sign

Kittens develop on a remarkably fixed schedule. That schedule is what makes age estimation possible, and it is why shelters can age an intake kitten in about thirty seconds. Here is every sign this tool uses and the window each one implies.

Teeth (the most reliable sign)

Kittens are born toothless. The tiny front incisors break through at two to four weeks, the little canine fangs follow at three to four weeks, and the premolars at the back come in at around six weeks — which completes the set of 26 baby teeth. Those baby teeth are small, needle-sharp and slightly see-through.

The adult set then replaces them on a second schedule. Adult incisors push the baby ones out at about 3.5 to 4 months, the adult canines and premolars follow at four to five months, and the molars arrive last. By around six months a cat has its full set of 30 large, opaque adult teeth — and from that point teeth stop telling you anything about age.

Eyes

Eyes are sealed shut at birth and open somewhere between six and twelve days. They stay a uniform baby blue for the first six weeks or so. At around seven weeks the adult colour starts bleeding through — green, gold, copper — and by eight weeks it has settled. Blue eyes on a kitten are a ceiling, not a floor: they tell you it is probably under seven weeks. Adult colour is the reverse: at least seven weeks, no upper bound.

Ears

Newborn ears are folded flat against the skull and the canals are closed. They begin unfolding at about three days, sit small and rounded through the second week, and stand fully upright and pointed by around three weeks. After that they stop changing, so upright ears only tell you "three weeks or older."

Umbilical cord

Useless most of the time and decisive when it applies. A cord still attached and damp means the kitten is a few days old at most — that is the narrowest window any single sign produces. Once it has dropped off, at around three days, it tells you nothing more.

Movement

A newborn cannot stand and moves by squirming. Wobbly first steps come at around two weeks, steady walking at three, and running, pouncing and play-fighting at four weeks and beyond. Full climbing coordination lands at around six weeks.

Weight, and why it's last

A healthy kitten weighs roughly 100 g at birth and gains 7 to 15 grams every single day. That daily gain is the basis of the ASPCA's weight chart and of our own kitten weight chart by week, and this tool inverts that same curve to turn a weight back into an age range.

But look at the arithmetic: a 7 g/day kitten and a 15 g/day kitten are more than twice as far apart at the same age, so a 400 g kitten is anywhere from three to six weeks old on weight alone. Worse, the gain rate assumes the kitten has been fed properly, and a great many found kittens have not. That is why the ASPCA's own chart carries the footnote this tool is built around: weight ranges "should be used in combination with developmental milestones when estimating age." Weight is a cross-check. The teeth are the answer.

Three worked examples

The bottle baby: eyes shut, cord attached

Cord still attached and damp, eyes sealed, ears folded flat, no teeth, can't stand. Those five signs overlap at 0 to 4 days old — high confidence, because the cord alone caps it at four days. This kitten needs milk replacer every two to three hours around the clock, needs to be stimulated to toilet after every feed, and above all needs to be warm before it is fed. A cold neonate cannot digest, and feeding one is how well-meaning finders lose them.

The classic four-week-old

Eyes open and blue, ears upright, front teeth and little fangs through but nothing at the back, walking steadily, 380 g. Teeth put it at three to five and a half weeks, ears say three weeks or older, the eyes cap it under seven weeks, and the weight agrees. The overlap lands at three to five weeks. This is the weaning window: still bottle feeding, but time to offer gruel in a shallow dish and set out a low litter tray.

The one the static charts get wrong

A full set of baby teeth, adult eye colour coming in, ears upright, running and pouncing — but it weighs only 300 g. The developmental signs all say six to eight weeks. The weight says two to four. On a printed chart you would look at the weight column, conclude "three weeks", and start bottle feeding a kitten that should be eating wet food.

This tool flags the contradiction, resolves it toward the teeth and eyes, and tells you what it actually means: this is a six-week-old kitten that is badly underweight. It needs feeding up and it needs a vet if it is not gaining. That single distinction is the reason this page exists.

Frequently asked questions

How can I tell how old a kitten I found is?

Check the teeth first, then the eyes and ears. No teeth and sealed eyes means under two weeks. Eyes open, ears upright and tiny front teeth means about three weeks. A full set of small sharp teeth with the eyes still blue means five to seven weeks. Adult eye colour with baby teeth means seven weeks or more. Enter what you see in the tool above and it will combine the signs and give you a window rather than a single guess.

How do you tell a kitten's age by its teeth?

Bare gums mean under three weeks. Tiny front incisors appear at two to four weeks, the canine fangs at three to four weeks, and the back premolars at about six weeks, completing the 26 baby teeth. Adult teeth then replace them starting at about 3.5 months, finishing with a full set of 30 by around six months. Baby teeth are noticeably smaller, sharper and more translucent than adult teeth.

Can I tell a kitten's age from its weight?

Only roughly, and only if the kitten has been fed properly. Kittens gain 7 to 15 grams a day from about 100 g at birth, so a rule of thumb is that a kitten weighs about a pound for each month of age up to five months. But the healthy range is wide, and an underfed or orphaned kitten will weigh like a much younger one. Use weight to confirm what the teeth and eyes tell you, not instead of them.

At what age can a kitten leave its mother?

Eight weeks at the absolute earliest, and many vets and rescues prefer ten to twelve. By eight weeks a kitten should be fully weaned, eating on its own, using a litter box reliably, and weighing around two pounds. The extra weeks with littermates are where bite inhibition and social skills get learned, which is why kittens taken at five or six weeks often grow into bitey adults.

What do I do if the kitten is only a few days old?

Warm it before you do anything else — a kitten under four weeks cannot regulate its own temperature, and a cold kitten cannot digest food. Warm it slowly against your skin over twenty to thirty minutes, then feed kitten milk replacer every two to three hours, and stimulate it to toilet after each feed. Never give cow's milk. If it is limp, cold, gasping or not gaining weight day over day, contact a vet or a local rescue immediately; neonates decline fast.

Can I embed this kitten age chart on my website?

Yes — copy the snippet at the bottom of this page. The embedded version is a clean, ad-free widget built for rescues, TNR groups, foster networks, shelters and veterinary educators. Attribution is included in the snippet; there is no fee, no signup and no tracking.

Related tools

• Kitten Weight Chart by Week — is this kitten gaining enough? →
• Kitten Feeding Schedule Calculator — how much and how often, by age →
• Cat Age Chart — for a grown cat, in human years →
• Cat Body Condition Score — is this cat too thin or too heavy? →
• Browse all free cat-care tools by Dr. Anand →

What a kitten that age actually needs

The estimator suggests gear that matches the age it returns, because the needs change completely every couple of weeks. Under four weeks it is milk replacer, a proper nursing bottle and a safe heat source — and the heat matters more than the food. From four to eight weeks it is weaning gruel in a shallow dish and a litter tray with sides low enough to climb into. Past eight weeks it is real kitten food and things to hunt.

Once the kitten is eating independently, Dr. Anand's roundup of the best kitten food covers the wet and dry formulas worth buying for growth, and the best cat litter boxes guide includes the low-entry designs that a small kitten can actually get into. For the play that a socialisation-stage kitten genuinely needs, see the best cat toys.

Methodology & sources

Each answer maps to a published age window, and the estimate is the intersection of every window you supply. Windows are deliberately widened to the union of the cited sources rather than picking one, because sources genuinely disagree by a few days on eye opening and premolar eruption, and a narrower window would be false precision.

When the windows don't overlap, the tool scores every day from birth to twelve months by how many signs accept it, weighted by how reliable each sign is, and reports the best-supported range plus the name of the dissenting sign. Teeth carry the highest weight and weight the lowest, so ties break toward development and away from the one sign that underfeeding distorts.

Weight-to-age is computed by inverting the same growth band that powers our kitten weight chart. An automated fixture test runs on every site build and asserts that the two engines are exact inverses across all 56 neonatal days and every growth anchor from eight to fifty-two weeks, so the two pages can never quietly contradict each other. The same test asserts that open-ended answers — a full adult set of teeth, upright ears — are never rendered as a confident number.

• ASPCApro — Kitten Age & Weight Chart (2023), the 7–15 g/day growth band and the footnote that weight should be combined with developmental milestones.
• Colorado State University — Dental Anatomy of Cats, the deciduous and permanent tooth eruption table.
• PetMD — Kitten Teething Guide, cross-reference for eruption and shedding ages and tooth counts.
• Alley Cat Allies — Kitten Progression, the day-by-day development record.
• Kitten Lady — How to Determine a Kitten's Age, week-by-week milestones and care schedule.

Developmental milestones are fixed biology and are not expected to change; sources are re-checked for currency annually. About Dr. Anand · Last reviewed August 30, 2026.

Embed this kitten age chart

Free for rescues, TNR groups, foster networks, shelters, veterinary educators and cat blogs. Required attribution is included in the snippet — no fee, no account, no tracking.

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  Kitten age chart by
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  &middot; Reviewed by Dr. Priya Anand, DVM, ABVP (Feline)
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