It is common for the hair to come in white before changing to a tan or gold.
Dig deep and you will find the hair so light that it will make it look like the puppy is almost going bald. It is so common that I warn my puppy buyers about that. Some will start "breaking" as its called anywhere from 9 weeks to close to a year old. If you'd like to email me a pic privately I'll look at it.
Its
starwoodyorkies@comcast.net. Some coats are finer or sparser than others also-- some is hereditary although some conditions can cause hair loss.
Low thyroid, some types of worms, fleas and vitamin deficiencies also can be problems. Hope this helps but I'm betting your little one is normal.
Best Wishes,
Brenda Smith
Starwood
Http://www.geocities.com/Heartland/Village/5495/