Here is the original thread that Momofthree started about her new baby. The pup is mix of Biewer and Yorkie..
http://www.yorkietalk.com/forums/showthread.php?t=27717
As for your babies. There more similarity to the cross pup than the True Biewer. Did you breed to a German imported TRUE Biewer? Then your pups are Yorkie Biewer cross..I prefer to say cross, mix doesn't sound as nice. Or was this out of Yorkie parents?