When choosing a breeder, keep the following in mind:
A kitten should be at least 8 weeks of age, or preferably older when separated from his or her mother - 12 weeks is ideal for social development as kittens go through a natural fear period from approximately day 56 to 70. There is also a peak period of social development from 9-14 weeks of age, where a kitten needs other kittens to play with. Allowing a kitten time to learn from his or her mother and siblings results in a better companion pet, with less behavioural problems. Separating a kitten from mom too early can lead to dependency issues and a host of other behavioural problems.
Vaccinations save lives. It takes approximately 14 days for a vaccination to become effective - your kitten should have received, at minimum, his or her first FVRCP vaccination, at least 14 days prior to the day you bring him or her home.