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    The Top 7 Pregnancy Myths

    Can you color your hair? Get a flu shot? Have sex? Experts clear up your biggest concerns.

    Myth: Avoid Hair Dyes

    No need to sport dark roots with your maternity wardrobe. Chemicals from hair dye, permanents, and relaxers are absorbed through the skin only in minimal amounts that aren't harmful.

    "We don't believe there's any fetal risk from hair dyes and such," Chescheir says. But strong odors from hair treatment products make some pregnant women feel nauseous. So use them, she says, in a well-ventilated space with a fan.

    You can hold off on hair treatments until you've passed your first trimester if you’re really worried. You can also avoid dyes with ammonia, which has strong fumes. "Hair changes a lot during pregnancy," Chescheir says. Products that worked well before pregnancy might not give the same results.

    Myth: Caffeine Is a No-No

    Do you love your morning cup of coffee? Many pregnant women do, but often they're warned to give up caffeine because it might cause miscarriage, preterm birth, or low birth weight.

    But the case against caffeine isn't strong. "There does not appear to be any relationship between caffeine consumption and preterm birth," Chescheir says. Also, if a pregnant woman drinks less than 200 milligrams of caffeine per day -- the amount in about one 12-ounce cup of coffee -- there's no clear evidence she faces any increased risk of miscarriage or low birth weight. So be prudent, Chescheir says. Enjoy your java, but stay within the recommended limit per day.

    Myth: Flying Can Increase Your Risk of Complications

    Airport body scanners, X-ray machines at security, radiation from flying at high altitudes -- think about all that and pretty soon, a staycation sounds awfully tempting.

    But don't worry about the small amounts of radiation that pregnant women might encounter while passing by or through an airport X-ray machine or flying at high altitudes, Chescheir says. "We get exposed to radiation all the time from being on the ground, and certainly flying increases that a bit. But the kind of radiation you're exposed to [during air travel] doesn't have much penetration into the body, so it's unlikely to ever cause fetal exposure at all."

    Nor are body scanners dangerous. "It's a very minute amount of radiation, and it's extremely unlikely to cause any sort of fetal effects," Chescheir says. Research evaluated by the FDA, the National Institute for Standards and Technology, and the Johns Hopkins University Applied Physics Laboratory back up her views. But "because there's a completely safe alternative," she says, "I would recommend that [pregnant] women get the pat-down. If they don't want to do that, they should be reassured that going through the body scanner should be fine."

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