I lost all my twelve children

I lost all my twelve children
I can't remember their name
I can't remember their look
They were the product of another world
They were barely alive for a few minutes

But they did exist
And they were so bright
They were in the forever land
But I've come out of it

There were twins, as I remember
There were boys and girls, as I wished
But I lost all of them
On my way out