Cheshirekatt,

Woohoo!! Another kitty! Good for you! Kittens are the easiest to introduce to your cats. I was going to suggest keeping the kitten isolated until she's got a clean bill of health by the vet. Oops, too late. Also, have the vet do a Teiter/Alisa test for Feline Leukemia/Feline Aids. Kittens that young usually test false positive when the "stick" test is done. The Teiter/Alisa test requires a blood sample and takes about 24-48 hours for the results. This way you don't put your other cats at risk.

Good luck with your new kitty! I hope everything turns out okay.