A childhood belief about getting pregnant

I was a very late addition to my family; basically, my parents had four kids in a row in the first four years of marriage, then waited fourteen years before deciding they wanted one more go at it, from which I was the result. So, my mother used to explain to me when I was a wee lad how much she and dad wanted to have one more child, and that they 'prayed and prayed' that god would give them one more.
Thus, I thought up until I was seven or eight that the whole secret of where babies comes from was simply...praying. Really hard.