Thanks for all the feedback, it has definately given me food for thought.
I can understand how a breeder would be looking out for the best interests of the pup, and I respect that. I guess I just wanted to make sure that yorkies don't have a crazy habit of attacking small children!
I'd like to think that I'm a responsible person that would both socialize a young pup to children and teach my (future) kids that a dog is not a playtoy.
I really really want a yorkie, but I also want to do the right thing.