Okay, this may sound a little crazy, but from the human end of things, I may be able to help. I am 48 and have almost all white hair in the front (I've been graying since my 20's - gotta love the Irish genes). Even though my hair is still very, very thick, I can see the scalp more where the hair is white. It's like an optical illusion. The darker hair is not obscuring the scalp anymore. Just a little food for thought.
On the Yorkie side of things, my Zeusy had white hair on his head at six months old. I could see that poor baby's scalp as well. Now at 18 months old, his hair is more cream/blonde on his head and you can't see the scalp. I think the color has a lot to do with what you see. His hair has turned more colors than leaves in the fall over this past year and a half. I think your baby's hair looks completely normal and definitely gorgeous!!
