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 (022000@1)     Bm (x24432@1)      B (x2444x@1)       A7 (x02020@1)      G (320003@1)       D (xx0232@1)       F# (244322@1)      Ee|-0---| (022100@1) 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/BClose (x20232@1)your eyes, have no fear
The monster's gone, he's on the run and your Daddy's here

Em (022000@1)                            D/BBeautiful, (x20232@1)beautiful, beautiful boy
Em (022000@1)                            D/BBeautiful, (x20232@1)beautiful, beautiful boy

D/BBefore (x20232@1)you go to sleep, say a little prayer
Every day, in every way, it's getting better and better

Em (022000@1)                            D/BBeautiful, (x20232@1)beautiful, beautiful boy
Em (022000@1)                            D/BBeautiful, (x20232@1)beautiful, beautiful boy

Bm (x24432@1)              BOut (x2444x@1)on the ocean, sailing away

G (320003@1)                DI (xx0232@1)can hardly wait! 
G (320003@1)                DTo (xx0232@1)see you come of age!
G (320003@1)                D (xx0232@1)                    A7 (x02020@1) G (320003@1) F# (244322@1)EBut (022100@1)I guess we'll both just have to have patience

G (320003@1)                        D'Cause (xx0232@1)it's a long way to go
G (320003@1)               DA (xx0232@1)hard row to hoe
G (320003@1)                    D (xx0232@1)              A7 (x02020@1)  G (320003@1) F# (244322@1)EYes (022100@1)it's a long way to go but in the meantime...

D/BBefore (x20232@1)you cross the street, take my hand
Life is what happens to you while you're busy making other plans

Em (022000@1)                            D/BBeautiful, (x20232@1)beautiful, beautiful boy
Em (022000@1)                            D/BBeautiful, (x20232@1)beautiful, beautiful boy
Em (022000@1)                            D/BDarling, (x20232@1)darling, darling [insert your boy's name here]