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    Toxins and Pregnancy

    You're finally pregnant – and the world seems fraught with dangers. Here's a guide to help you navigate through the legitimate concerns and the baseless worries.
    By
    WebMD Feature
    Reviewed by Louise Chang, MD

    When you're expecting a baby, how vigilant do you need to be about possible toxins? Sure, you'll want to steer clear of smokers, the cat's litter box, and margaritas. But what about the sushi bar, nail polish, and bottled water?

    With new alarms sounded almost daily, it's a challenge to know what to do.

    WebMD turned to the experts for advice. Unfortunately, the territory is not clearly charted. Besides the known risks, there lurks a vast gray area in which the research is inconclusive. According to the March of Dimes web site, the cause of about 70% of birth defects is unknown. And most known defects are due to genetic or other unpreventable causes -- not to mom's exposure to toxic chemicals, foods, drugs, or infections.

    So is there any way to lower the risk? The following information should help you separate the facts from the likely fiction.

    Known Risks

    Substances that can cause birth defects are called "teratogens." Exposure to them does not automatically put your fetus at risk. The level and length of time of exposure, as well as the stage of the pregnancy at time of exposure, can come into play. According to the educational bulletin on teratology published by the American College of Obstetrics and Gynecology (ACOG), the following are among the known causes of birth defects:

    Drugs and Chemicals

    Infections

    Radiation

    Worse Than Thalidomide

    The thalidomide scare of the 1960s is legendary. Yet in terms of risk and impact, it pales in comparison to isotretinoin, best-known by the brand name Accutane, according to Lynn Martinez, Utah State Health Department coordinator of the Pregnancy Riskline in Salt Lake City.

    "It's an amazing drug approved for severe nodular or cystic acne, but it's estimated that in the U.S., 90% of prescriptions are off label. Someone gets an outbreak of pimples and wants Accutane," she says.

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