I know as a registered breeder they strongly advise you to keep your kittens until they are 13 weeks old (which is what i do) but my vet keeps telling me that there is no reason to wait until they are 13 weeks old. He says that for mummy they are better off leaving perhaps each week from 8 weeks then all going the day they turn 13 weeks? I did point out that for the vaccinations they should remain with me but obviously if the kitten gets vaccinated by the new owners then it is no disadvantage to the kitten. It has got me thinking that's all?