Hey your not kidding that St. Bernard puppies are adorable. They are great! Just be careful how often you tell him that or you will end up with this.
He knows he is cute too and he thinks he can get through life on his good looks alone. LOL So far, he has been right. My advice to you, spend a lot of time socializing him now. touch every part of him every day to get him used to handling, clipping nails, brushing teeth, cleaning ears, brushing etc... In as few as a few months you might not be able to lift that little ball of fluff and love. Oh and Take thousands of pictures and share them on dog forum.