[mscat]

People who advertise "tea cup"yorkie's for sell are only after the sellers money, the smaller the yorkie the more likely the pup can have genetic problems to liver shunts, try to stay from that. The average size of a yorkie should be between 4-7 Lbs, that is small. SOme yorkies will grow bigger then that so it can be difficult to determin how big the puppy will be fully grown. Even my 10 pound yorkie is small, she has fairly long hair right now that makes her look a little bigger, these are fragile dogs who can be highly tempermental and can have a stubborn streak, as you probably already are aware of. A pet farm to me = a puppymill, be careful not to go there, or be tempted to buy from a puppy store either, they will have outrageous fees, and often they get their pups from mills.
Look for reputable breeders in your area, however, the cost will be at least twice as much as your wanting to pay for a healthy puppy. Plus the costs of vet care for the first year is expensive. I think you ought to read some of yt's threads and get a good feel about them, often times little children and little puppies are not a ood match, but it depends on the child too.