um, i think he just likes the sound of his own voice. you don't scare him or anything right? He's still a puppy. maybe he just really wants to play, or to get your attention. if you really can't take it any more, you can get a spray bottle and just mist his face and say "No" or "Enough". Enough is probably the better word so that he doesn't stop barking all together. you want him to alert you when people come to your house. Another thing you could try is a can with cions in it. Its really loud and it will be louder then his niose so hie'll stop.
PLEASE DO NOT BUY AN AUTOMATIC SPRAY COLLAR FOR HIM. HES TOOO YOUNG FOR THAT!!!
BEST WISHES! ENJOY HIM! *