Study links Pesticides to Birth Defects
Researchers analyzed all 30.1 million births in the United States between 1996 and 2002. They found a strong association between higher rates of birth defects among women whose last menstrual period was in April, May, June or July and elevated levels of nitrates, atrazine and other pesticides in surface water during those same months.
Source: http://health.msn.com/kids-health/articlepage.aspx?cp-documentid=100235696