Found the guitar chords:
Capo 2

The basic chord pattern is Am C G, using the Am/B step-up to lead into
the C. The timing is essentially follow that of the Intro, but with
some slight variation...

  Intro: 
  | Am - - Am/B | C - - - | G - - - | - - - - | (x3)
  
                                             Oh I 
  | G - - - | Gsus4 - - - | Am - - - | - - - - |
  
  Verse:
  wish...
  | Am - - Am/B | C - - - | G - - - | - - - - | (repeat)
  

http://www.fretplay.com/tabs/b/be_good_tanyas/i_wish_my_baby_was_born-crd.shtml
And you can buy the sheet music here
Click