Yorkie AKC standard is not to exceed 7lbs.
Did I read on another thread your little girl is almost 7 years old? If so please don't breed her again she is a 50 year old dog
therefore far too old for birthing, be very careful, if not you could lose her.
Do you have her eating puppy food? if not you need to do this right away, this will help ensure that she gets the appropriate nutritional requirements of an expectant and nursing mother.
besure and give her suppliments at least 2 weeks prior to birthing all the way through weaning. Pettabs or Nu-Vet work well, then include goats milk, cottage cheese or yogart daily while nursing. DO NOT USE cow milk dogs are lactose intolerant.
Some older dogs will suffer milk failure or insufficient milk before their puppies are weaned also at high risk is eclampsia. These dogs need to be taken directly to a veterinarian and the puppies must be bottle supplemented or raised by hand.
Eclampsia (or milk fever) occurs in lactating bitches and is caused by a drain of calcium from the system. The onset is very sudden and symptoms include staggering, un-coordinated movements that can lead to total collapse and loss of consciousness. A bitch suffering from eclampsia must have calcium administered intravenously immediately or she will die.
hope this helps