I'm curious about my little Ruby's coloring as well.  She looked very much like your little baby's coloring around this time last year.  Now, that she's a full year old she's looking more blonde ??  with greyish black on the back.  Someone was telling me that she would continue to change color as she aged.  I wasn't really aware Yorkies would do this but what do I know.  She's my only yorkie.  
 
I remember her looking like she was going bald too.  lol  I guess that's just something they go through.  Yorkie's are so sweet.  I can't imagine what we ever did without our little Ruby.  
