[maggiesmom_2007]

Like Yorkierose said the Standard says not to exceed 7 lbs.
You can end up with all variations of size even if you breed to the standard. You have to remember that it's not just the parents that determine the size it is also the grandparents and sometimes further back. This is why responsible breeders do not guarantee size. They will usually give you a range. Like for instance I have a 5lb female and she was bred to a 4lb male but I had a pup that at 5 months is just 2lbs while the other two are almost 4lbs. I know whats behind both the sire and dam so although I am surprised by the 2lb girl it's in my Dams background. Just as I am quite sure the other two may make it to about 5lbs give or take. Something I like to do is look at their features ifthey look small then there is a good chance they won't get very big but if their nose and paws are big then there is a good chance they will grow into then. I won't say this is a true method but it works for me, Just as the weight chart work for other people.