All right, I understand that "Hey Jude" can be a divisive song, with people loving or hating it and not really in between. However, I do believe that there is not a single person alive who can't enjoy this kid's devotion to his passion: being cute.
This Kid epitomizes (perhaps?) that wonderful childhood quality of self-gratification and self-satisfaction. He's doing what he loves because it makes him feel good. He loves the song, so he's gonna sing it. And he's gonna do it in his diapers, by gum. Anyway, the cutest kid ever.