How to Pick a Healthy Kitten: Age, Nerve, Three Checks

Choosing a kitten comes down to three things you can check in 15 minutes: age at separation, which kitten walks toward you, and what the eyes, nose and anus look like right now. A kitten sold at 6 weeks is not a bargain. It is a kitten that missed 2 to 4 weeks of immunity, weaning practice and social learning, and the first vet bill often lands within a month.

Why 8 weeks is the floor, not a target

Between 4 and 8 weeks a kitten moves from milk to solid food, learns bite inhibition from siblings, and finishes the maternal antibody window that determines how well vaccines will work. Separating before 56 days raises the risk of food refusal, poor litter box use and fear-based biting that can take months to unwind. Many breeders and shelters now hold kittens to 10 to 12 weeks, and there is a practical reason: at 8 weeks a kitten still needs 4 meals a day and cannot regulate its own intake well. Ask for the exact birth date, not the week, and count the days yourself.

Pick the one that comes to you

Sit on the floor of the kitten room and stay quiet for 5 minutes. The kitten worth taking is the one that approaches within a minute, sniffs your hand, gets startled by a dropped set of keys and recovers within about 10 seconds. That recovery time is the single best predictor of a cat that copes with a new home. The quiet kitten pressed into the corner is not calm; it is shut down, and it is often the one with a low-grade illness or the one that has been bullied off the food. Do not choose the most active kitten either, if it never settles: constant frantic motion in a 9-week-old can signal pain or hunger. Ask to see the whole litter together, and watch who eats first.

The three-point physical check

Do this with the kitten on a table under good light, before any paperwork.

Point	Normal	Walk away if
Eyes	clear, equal pupils, no discharge, third eyelid barely visible	yellow or green discharge, squinting, cloudy cornea, one pupil larger
Nose	dry to slightly damp, no crust, breathing silent	sneezing, thick discharge, open mouth breathing, noisy inhale
Anus	clean, pale pink, no matted fur	dried stool on the fur, redness, swelling, visible worms, scooting

Add four checks while you are there. Gums should be pink and refill within 2 seconds when pressed. The belly should be soft, not drum-tight. Run a damp white paper towel against the coat: black flecks mean flea dirt. Watch the kitten walk away from you; a wobbly or stiff gait at 9 weeks is not clumsiness. A kitten who is 8 weeks old should weigh roughly 800 g to 1 kg, tracking the rule of about 450 g per month of age, and the weight should match the stated birth date.

Records: what a real vaccination history contains

Ask for a printed card, not a verbal assurance. A properly vaccinated 8 to 9 week old kitten has had at least one FVRCP injection, given no earlier than 6 weeks, with the date, product name and batch written down, plus a second dose scheduled 3 to 4 weeks later and a final dose at 16 weeks. Rabies is usually given at 12 to 16 weeks, so it may still be pending, which is fine. Deworming should show at least two treatments, typically at 2 and 4 weeks then every 2 weeks to 8 weeks, with the drug name listed. Ask whether the mother was tested for FeLV and FIV, and whether the kitten itself was tested after 12 weeks. No paperwork, no sale.

What it costs in the first 90 days

Budget for the completion of the vaccine series, 2 to 3 more dewormings, flea and tick prevention, microchipping, and a wellness exam within 72 hours of arrival, which most vets will do for a new kitten at a reduced fee. Plan the sterilization date at 4 to 6 months. Add a scratching post, 2 litter boxes and a carrier before the kitten arrives, not after. The /tools/vaccine-calendar/ tool lays the dates out by birth date so you are not recalculating intervals in your head.

Setting up the first week

One room, 2 to 3 square metres, with food, water, litter box, hiding box and a soft bed. Keep the litter box away from food by at least 1 metre. Expect the kitten to hide for 6 to 24 hours; do not pull it out. Sit and talk, offer food from your hand, and let it come. Start litter box routine on day one, because habits formed in week one last, and /kitten/kitten-litter-box-training/ covers the placement and cleaning schedule that prevents most accidents. Mouthing starts around 10 to 12 weeks with the adult teeth, and /kitten/kitten-play-biting/ explains the 2-minute redirect that stops it becoming a habit.

When to walk away

• Under 8 weeks old, or the seller will not give a birth date.
• No vaccination or deworming record, or records with no dates or batch numbers.
• Discharge from eyes or nose, or diarrhea visible in the carrier.
• A kitten kept apart from the litter with no explanation.
• Pressure to pay a deposit before you see the mother or the room.

Your first 48 hours

1. Book the wellness exam for within 72 hours, before you introduce other pets.
2. Weigh the kitten on arrival and again at 7 days; expect 50 to 100 g of gain in that week.
3. Feed 4 small meals a day of kitten-formula food for the first 2 weeks.
4. Confine to one room for 3 to 7 days, then open the rest of the house.
5. Write the next vaccine and deworming dates on the calendar the day you get home.

The kitten that scores well on age, approach and the three-point check is rarely the cheapest one in the litter. It is the one whose first year costs the least in vet visits and behaviour repair.

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