Single puppy litters need almost more work than a big litter of puppies. Because there is only 1 puppy, he won't learn the kinds of things from his littermates that normal puppies would. You also have to be careful not to baby him too much, otherwise he'll expect that all his life. He will need LOTS of extra socialization with other dogs that a normal puppy wouldn't. Be sure to get him in a puppy kindergarden type class as soon as he's old enough.