What Is The Country Song About An Expecting Dad Who Ends Up Having A Girl Instead Of The Boy He Wanted?

Its Carrie Underwood's All American Girl
the lyrics go like this
since the day they got married he had been praying for a little baby boy... But when the nurse came in with a little pink blanket all those big dreams changed

Not sure if this helps, but there was a country song a long time ago about a man expecting a son and having a girl.
It was called "daddy's girl" by Red Sovine. Here are some lyrics:

I said now Doc
You must be wrong
You see I want a boy
Then he laid you in my arms
and my heart sang with joy

Daddy's girl
Daddy'girl
I'm the center
of daddy's world
I know I'm Daddy's number 1
For he loves me like I was his son.

I do hope that helps!