Hi and Welcome to YT!
Some can look like "teddy bears" when they are young...it's the way the hair grows out. There is not a Yorkie that is named a "Teddy Bear Yorkie" though.
Your baby is very young and too young to be away from it's mother, so you will need to watch him closely for a while. I would take him to a vet and make sure he's okay for now. He's still young and has to be kept away from other dogs and parks untill he's had all of his puppy shots and that will take a while. Make sure he's eating and drinking. Young Yorkies are subject to low blood sugar. Get him neutered and you should not have marking problems. I'd do this as soon as the vet says he's ready.
What did you name him?