He's manipulating you to give him attention or give him any and everything he wants. I would start training him that he will get the exact opposite of his desires. Leave the room yourself, go into another room with the door shut behind you, go outside and shut the door behind you or simply turn your back. Another way to stop this behavior is to summarily take him from the room and place him in another room with the door closed until he has been quiet for 15 minutes. That is a strict time - don't fudge. 15 minutes of total quiet no matter what. During that time, he will be having a fit perhaps but eventually a smart dog will settle himself and go quiet to listen, eventually even lie down and nap and once he's quiet, he'll learn that in time you come for him. Before long, he can even gauge when the 15 minutes are up after he's quiet. If you do this enough times and every single whine, he will begin to associate his whining with being immediately alone and for a long time. Some dogs - not many but some - will learn not to whine from just turning your back on them but the real little dictators(
) have to be removed and placed in another room. Some find their dog reacts quicker by them leaving the scene of the whining and staying away for a good 15 minutes - but most owners hate to make themselves sit in another room or outside for 15 minutes! Whatever works best for you and your baby, though, is the best course for you.
Also, if you aren't already, get your baby busy learning obedience and if he's doing that, he's already learned to listen to and obey you and probably has learned the meaning of the word "No". An obedient, well-trained dog needs only to be told "no" a few times and they will stop themselves, quickly controlling their impulse to whine as they realize they are your team-member, want to please you, don't like to hear you utter the word "no" and want you happy with them. They have learned from all the training that obeying you is the happiest and best way to go for their own interests. That's why obedience training that is ongoing is a smart thing to do with your dog because it can stop new bad behaviors very quickly.