Christina Rosetti has a poem by that title, and I found another song similar:

Christina Rosetti?
Or maybe:

Gentle Gentle (Life of your life)
By Rebecca Lavelle

Gentle gentle sing to your child
Your companion for such a long long time
Beneath your heart
Her heart beats strong
Life of your life
Is safe in your arms

Touch her face
You gave her form
Child of this earth
Child of the sky
You are her voice
She has your eyes
This is her gift
The thread of life

Give her grace
Give her peace
Let her be strong
Let her be kind
She is your soul
And you are her strength
Bless her and guide her all of her life

Gentle gentle sing to your child
Your companion for such a long long time
Beneath your heart
Her heart beats strong
Life of your life
Is safe in your arms

from:http://www.lyricsdownload.com/rebecca-lavelle-gentle-gentle-life-of-your-life-lyrics.html