Kitten first year schedule
A kitten’s first year moves through vaccination courses, a fast-changing worming rhythm, a socialisation window, and a neutering decision — usually inside twelve months that also include the biggest jump in size and behaviour a cat will ever go through. This guide lays the year out in order so a new kitten owner can see what is coming next.
Last updated 2026-07-19
| Stage | Timing | What happens |
|---|---|---|
| 6–9 weeks | Before rehoming, usually by the breeder or shelter | First vaccination dose and first deworming, alongside a general health check. |
| 9–12 weeks | ~3–4 weeks after dose one | Second vaccination; core protection typically builds meaningfully after this dose, but confirm timing with your vet before unsupervised outdoor access. |
| 2–12 weeks old | Every 2 weeks | Worming continues fortnightly while the kitten is very young, since kittens can carry worms from birth or through milk. |
| 2–7 weeks old | Socialisation window | The period considered most sensitive for positive exposure to handling, other animals and everyday household sounds. |
| 3–6 months old | Monthly | Worming moves to monthly; flea prevention typically starts once the kitten clears a product’s minimum age and weight — check the label, not just the calendar. |
| 4–6 months | Vet-guided | Spay/neuter timing conversation — commonly discussed around this age, but confirmed by your vet for the individual kitten. |
| 12 months | Once | First annual health check and the move onto an adult booster and prevention schedule. |
Why this order matters
Kittens carry a heavier early parasite and vaccine-timing dependency than adult cats because maternal antibody levels are unpredictable and fade at different rates animal to animal, which is why the early vaccine doses are spaced rather than given all at once. The socialisation window for cats closes earlier than for dogs — often cited as ending around 7 weeks — which is one reason breeders and shelters front-load a great deal of handling before a kitten is even rehomed. Because an indoor-only kitten’s risk profile differs sharply from one with any outdoor access, the exact worming and flea interval a vet recommends after the first year can vary more than the fixed first-year course does.
What happens if you miss a step
A missed kitten vaccination dose can change how much protection has actually built up and may change your vet’s recommended next date — confirm with the practice rather than assuming the original schedule still applies. A missed worming date at this age is common and usually low-stakes to catch up on promptly. As with puppies, write the exact date down; a kitten’s early schedule compresses enough milestones into a few months that "sometime last month" is not precise enough to plan around.
When to ask your vet
This is a general sequence for a healthy kitten in a typical household, not an individual veterinary protocol. Bottle-raised kittens, kittens with unknown history from a rescue, and any kitten showing illness should follow their vet’s specific plan instead. Seek prompt veterinary advice for vomiting, diarrhoea, lethargy, reduced appetite, or if a kitten stops growing at the expected rate.
How to keep the record useful
Because the kitten year has more density in its first four months than any other stretch of a cat’s life, the most reliable way to stay on top of it is logging each event on the day it happens rather than relying on a shelter’s printed card, which can be misplaced during the move into a new home.
A record that automatically calculates the next due date from the last logged one removes the guesswork of tracking multiple overlapping fortnightly and monthly intervals at once — which is exactly when new kitten owners are least likely to have the mental bandwidth for manual tracking.
Frequently asked questions
Do indoor-only kittens need the same schedule?
The vaccination and early worming course is generally recommended regardless of indoor status; ongoing adult-year flea and worming frequency is where indoor-only cats often move to a lighter schedule, decided with your vet.
Why does the socialisation window close so early for kittens?
It is generally considered to close earlier than a puppy’s, which is why breeders and shelters concentrate handling and exposure before a kitten is typically rehomed at 8–12 weeks.
What if my kitten came from an unknown background?
Treat the vaccination and worming history as unknown and let your vet restart or adjust the course — do not assume any prior treatment happened on schedule.