[aimee]

The general rule (term I am using loosly - there are exceptions to every rule) to Yorkies is to take the 12 week weight and double it to get an estimate on full grown weight. If this rule will apply to your puppy, sounds like he will be rather on the large side. But again, this rule doesn't work for everyone.

Yorkie puppies gain most of their weight in the first 6-7 months but can put on a little more up to a year or so after that, filling out. This is what I was told anyway. How much were you told the parents weighed? This also plays a role in how your puppy will turn out, as well as the weights of generations back.