Welcome to YT. 7 weeks is very young to be away from momma, and he may have issues with hypoglycemia. Read up under breeders section and just read through any threads about young puppies. Be sure and feed multiple times daily, watch for lethargy, altered mental status, unsteadiness, vomiting and make sure he eats ands drinks well after any play periods. Get him vetted immediately and a health check, makes sure shots are up to date and don't take him outside on the ground or to any public areas until his series of shots are all completed (12-14 weeks?) Baby yorkies don't have a lot of reserves, so if he gets sick, get him to a very immediately. Weigh him regularly and make sure he is progressing adequately.
Also, post pics! We love pics!!!
Welcome to YT and congrats on your new furbaby! What's his name?
