Formula or Breast milk? Try to pump if your fiance can, it is way way better! Also, Keep them swaddled tightly. That helped my little boy a lot.. When he was wrapped up he was super happy, With free arms he screamed like no one has ever screamed before. EVER.
Also, (and yeah I may be a hippy) go read books by Dr. Sears. Follow his advice and you are guaranteed to have a happy baby..