The puppy needs to be in a stable home without a lot of changing back and forth.
Pups that get stressed from changes can become sick with coccidia and also can go hypoglycemic.
This pup is not even fully vaccinated so it definitely must stay at your house until the pup is protected with proper vaccinations.
I hate to hear the breeder let the pup go at such a young age.

Best of luck with the pup.
Just remember these Yorkie babies are like real babies.
They need lots of TLC and you have to watch them closely.
Deana
Prestigeous Yorkies and 2 Maltese