1 Aggressive Male, 1 Female and 1 Male Puppy

Question
I have 2 one year old puppys and one 6 month old puppy just adopted that weighs 60lbs....  The 1 year old male is aggressive towards the baby.  What can I do to stop this?  The baby doesnt fight back.

Answer
Whatever made you think you could bring a male into a house with another male and a female in the first place? Occasionally you can raise two males together without a female in the house, but this is never going to work. I suggest finding one or the other male a good home.