As a registered breeder, we are bound to keep our kitties until they are at least 13 weeks old. Personally I think this is for the best interest of the kitten. A lot of moggies are sold at 8 weeks but I think they are better equipped to face life on their own 4 feet if they are left til later and to me seem better grounded at that age.

Also I do vaccinate all kittens, and touch wood have never had any adverse reactions. However the vets do not give first innoculations til the kit is 10 weeks old and then the second jab is at 13 weeks, so they cant go before that age in any case.