I would interpret it like this:
>
The number of children that women give birth to.
> ****
The number of children that **one** woman gives birth to. In other words, the number of children born per woman.
I would interpret it like this:
>
The number of children that women give birth to.
> ****
The number of children that **one** woman gives birth to. In other words, the number of children born per woman.