I have become friendly with a yorkie breeder in my area. I am not quite ready to add a new little one yet. She just had a litter Nov. 30th, 2007. It is a litter of three. Mom 8 pounds (cute

) and dad 5 pounds (gorgeous

). The puppies are black and tan but with white striped chests and the tips of their feet are white as well. The puppies were born at 5 oz, 5.5 oz, 8 oz. and are currently over 1 pound each. Does this seem possible? It seems like the puppies are really big for only 10 days. The puppies are cute as a button but I am hoping to purchase a yorkie female for breeding purposes. The breeder seems to be sure that the puppies will be around standard but no one can be positive. Do these puppies seem like they could be 100% purebred? The breeder showed me both parents AKC papers but it is possible that some where in the lineage a mix could have occured that the breeder does not know about. The breeder only breeds yorkies.
Ex. Breeder X breeds yorkies and s**t tzus. Breeder X breeds female 1 to male 1 both yorkies but she does not know that one of her s**t tzu got her female while she was out because husband accidently left the female unattended. So as far as Breeder X knows the puppies produced are yorkies so she registers them as such. Breeder Y buys a puppy from breeder X and know the line continues with a s**t tzu mix.
Does this make sense? I only question these puppies because there are some people on this site that have month old puppies that are barely 1 pound. Am probably over reacting but I don't want to fall for another teapot if I can help it.