BEST of all worlds. You have no competition and gamemanship from siblings. You have all the individual time to pursue hobbies, read, and other interests. You also have a great,unfettered childhood. You are closer to your parents than your counterparts with siblings. You can be your own individual person, not being constantly compared to siblings. Most of all, you have PRIVACY. What MORE can ONE ask for? Yes, onlies are the luckiest and freest of all birth orders.