This isn't the exact song as Lennon plays it, but this version is really nice to 
play softly when you're trying to get your twin boys to sleep ;)

D/B - Basically just hammer off and on the B string as you strum a normal D chord. 

e|-2--2--2-2--|
B|-0--3h-3-3--|
G|-2--2--2-2--|
D|-0--0--0-0--|
A|-x--x--x-x--|
E|-x--x--x-x--|
 
The rest of the chords are pretty much the conventional versions:
    Em       Bm        B         A7        G         D         F#        E
e|-0---|  e|-2---|  e|-2---|  e|-0---|  e|-3---|  e|-2---|  e|-2---|  e|-0---|
B|-0---|  B|-3---|  B|-4---|  B|-2---|  B|-0---|  B|-3---|  B|-2---|  B|-0---|
G|-0---|  G|-4---|  G|-4---|  G|-0---|  G|-0---|  G|-2---|  G|-3---|  G|-1---|
D|-2---|  D|-4---|  D|-4---|  D|-2---|  D|-0---|  D|-0---|  D|-4---|  D|-2---|
A|-2---|  A|-2---|  A|-2---|  A|-0---|  A|-2---|  A|-x---|  A|-4---|  A|-2---|
E|-0---|  E|-2---|  E|-2---|  E|-x---|  E|-3---|  E|-x---|  E|-2---|  E|-0---|


D/B
Close your eyes, have no fear
The monster's gone, he's on the run and your Daddy's here

Em                              D/B
Beautiful, beautiful, beautiful boy
Em                              D/B
Beautiful, beautiful, beautiful boy

D/B
Before you go to sleep, say a little prayer
Every day, in every way, it's getting better and better

Em                              D/B
Beautiful, beautiful, beautiful boy
Em                              D/B
Beautiful, beautiful, beautiful boy

Bm                B
Out on the ocean, sailing away

G                  D
I can hardly wait! 
G                  D
To see you come of age!
G                  D                      A7   G   F#  E
But I guess we'll both just have to have patience

G                          D
'Cause it's a long way to go
G                 D
A hard row to hoe
G                      D                A7    G   F#  E
Yes it's a long way to go but in the meantime...

D/B
Before you cross the street, take my hand
Life is what happens to you while you're busy making other plans

Em                              D/B
Beautiful, beautiful, beautiful boy
Em                              D/B
Beautiful, beautiful, beautiful boy
Em                              D/B
Darling, darling, darling [insert your boy's name here]