My Little Pretty unborn baby

Hush little baby don't say a word
Mama is gonna buy you a mocking bird
But it's not going to happen
Because my little pretty baby isn't here anymore
You left this life still unborn
You were drained out of me
Taking the juice of life with you
Never breathed our air
I will never see you again
To a better heaven you went
Leaving me with grieve and regret
I wonder if I did something wrong
To lose you and be left here alone to long
To see how you'd have looked
and the way you'd have talked
But now am left to memories and nightmares
Of the horrible night you left me and went
I am sorry my little baby I never were
A better mother in a life so unfair

I wrote that after my older sister lost her baby (she was only three month pregnant but it really broke her heart) and she always felt guilty for it.