Hi there is a great breere site
www.yorkiepassion.com she post a weight chart. Our new baby Butler was 40oz at 8 weeks, he's alomst six pounds
at 16 weeks! Our girl Francie is 11 lbs. so we asked for a larger one, they are considered the runts of the litter. In my eyes they are perfect!!
Once you have the chart you can see where your little one is headed. You have to Google ounces to lbs conversion (unless you're Einstein!).
My guess is yours will be 5/6 pounds.
Congratulations!