I have had 4 youkies now and none of them even resembled the parents. All my girls were less than 3 pounds and the parents were all 4 and above with different coloring. As far as size goes, you can tripple the weight for an 8 week pup and double the weight for a 12 week pup. Of course this is just a good guestimate, but it has been infallible for me so far.
I now have Dennis, and he was 1.3 at 8 1/2 weeks and now at 14 ½ weeks is 1.7 which should bring him in at about 2 1/2 to 2 3/4. Both his parents were also about 4 to 5 pounds and bare little resemblance to him.
Hope this helps.
Sue |