Hi, karen & welcome to yt
There are many different sized yorkies, i have 4 and not one are the same in weight, my new baby is 13 wks and weigh 1pd 6oz, and my joey he is the biggest weighing in at about 7lbs, he is 2ys old, so i guess you never really know untill they are done growing, there is a lot of info on here about size, to me it dont matter the bigger the better
would love to see pics of lincoln.