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aiinuugii meuiicti dviciivc long been aware of the fact that just about everything a pregnant woman eats, or drinks, or inhales, or manufactures in her body processes, is transmitted, via the placenta, to the blood stream of her unborn child, we still are in the dark about how these'substances affect the baby once they get through the placenta.
This changes some of the thinking about the causes of birth defects. Formerly, many biologists attributed almost every malformation in a newborn baby to heredity. Today, we know that there is a fantastic array of newly discovered .•hemicals in our lives that were not there a generation ago—a wide variety of drugs, insecticides, sprays of all kinds. Science is beginning to amass evidence of the possible effects of these chemicals.
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