The secret to loving your children well is showing them how to live well through the choices you make. One of my girls is pregnant. It was surprising to me how many foods and medicines she has been told to avoid for the health of her baby. One of them is lunch meat. I think that is all I ate with my third pregnancy just 23 years ago! Much new research has improved what we know about protecting the health of children in the womb.

But what about protecting children in the home? The cultural acc...