Hi Welcome to YT! I wonder why you already have your baby at 8 weeks? Pups should stay with their moms till at least 12 weeks

they are better socialized, usually healthier pups. Not a good sign that the breeder(?) let you take him so early. How long have you had him? Maybe he is scared? Usually pups don't start barking until about at least 4 months. Anyway, usually dogs do not bark just to hear themselves barking. They are trying to tell you something. Try to determine what it is they want to tell you and address the issue. If you have any questions, there are lots of knowledgeable people here on YT. We alwayss try to help each other out. Good luck!