Health cover comes before social life
The timing rests on two health conditions, not on the kitten's curiosity. Her own initial vaccinations need to be in place and given time to take effect, as her vet advises, because the early weeks are when her mother's protection is fading and her own is still building. The adult cat must be genuinely up to date with vaccinations, healthy, free of fleas and worms, and known to be free of infectious illness — a friendly temperament does not compensate for unknown health status. If either side has a runny nose, sneezing, diarrhoea, or a recent illness, postpone; socialisation can be rescheduled, but an infection passed to a young kitten cannot be undone.
Choose the adult cat as carefully as the timing
The right first adult is calm, cat-experienced, and unbothered: an older neutered cat who has lived peacefully with other cats is a far better teacher than a playful youngster who may bowl a kitten over. A single adult at a time is enough — a group of strange cats overwhelms a kitten and makes it impossible to tell who she is reacting to. Meet on neutral ground where possible, or in a room the adult does not strongly claim, with hiding places and an easy exit route for the kitten so she never has to choose between fighting and freezing.
Build up in stages over days
Begin with scent: swap bedding between the households or rub each cat with a cloth and let the other investigate it. Next, let them see each other through a baby gate, carrier door, or cracked door, with food or play on each side so the sight of the stranger predicts good things. Only then try a short shared session, supervised throughout, ending while things are still calm rather than after they sour. A hiss or a retreat is information, not failure — increase distance and try again another day. Growling, chasing, cornering, or a kitten who goes flat and silent means the session ends immediately and the stages go back a step.
What good early meetings actually teach
A kitten who meets a polite adult learns feline manners she cannot learn from humans: how to read a tail and ear warning, how to break off play, and how to share space without conflict. Those lessons protect her in every future multi-cat home and cattery stay. Keep sessions frequent and short rather than rare and long, and always let her return to her own safe space and littermates or family afterwards, because confidence grows from meetings she can leave.
Finding cats you can trust locally
The practical difficulty is finding an adult whose vaccination status and temperament you actually know, rather than a neighbour's cat whose history is a guess. Local pet families you are connected with, whose cats' records and characters are familiar, are the sensible pool for these first introductions. KinsLe Circle of Love links your kitten's free profile into a wider local network of nearby pet lovers, making it easier to arrange those early meetings with families and cats you know and trust.