[topknot]

No, you cannot predict weight at such a young age. Especially if the number of pups are many - in this case the pups' weight may be low in the beginning right after birth or can go the other way if only one or two pups in a litter weights tend to be higher since they get more of the nutrients from the mom and less to share around. It also depends on the mom and how well she is producing milk. Also there are genetics that play a part and bigger yorkies with genetic make up can produce pups with bigger pups. One must pay attention too in the other extreme then since smaller yorkies do not necessarily produce small pups and whelping a litter can injure a mom and can even cause c-sections, or even death.

With all that being said - the rule of thumb (which is not written in stone either) is to double the weight at 12 weeks of age. A lot depends on genetics as the others have stated - depends on the lines (pedigrees). I have seen some pups grow fast to begin with and then stop or slow down and wishing and praying they grow a bit more in the end. Some have had their pups grow fast and continue to grow and not stop till 2 years of age. I have seen the - smallest pup in the litter grow up to be the biggest. You just can not be sure with yorkies unless you know their line/pedigree. This is more than knowing just the parents size. And in some cases even more than the grandparents sizes. There is a lot that goes into breeding and producing a wonderful dog/litter. There is a Lot of research, evaluating, and testing.