Hi, Welcome to YT
Most reputable breeders will not allow their puppies to leave until they are 12 weeks old. Yorkie puppies, especially "teacup" ones are very small and shouldn't be allowed to leave any earlier. They need more time with their mother and siblings.
Also you do not want to get a yorkie from a breeder that is advertising the puppies as "teacups". Technically there is no such thing as a teacup yorkie. It is a term used by bad breeders to get more money for their puppies. You need to be careful where you get your pup from because there are MANY "breeders" out there looking to make a quick buck.
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