If you can offer your neighbour's baby for food, then I am pretty sure you didn't impregnate her. No affairs between neighbours like the stereotype passionate people portrayal in movie? That is disappointing.
I had natto once in Japan. It is like the burning flavour in your mouth and nose of wasabi but stale. Go and have a try if you are really curious. But don't complain and hate me if you vomit or choke. I warned you, its not a food with present taste.