Upside to Morning Sickness: Fewer Miscarriages, Stillbirths | NBC Connecticut
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Upside to Morning Sickness: Fewer Miscarriages, Stillbirths

Led by researchers at the National Institute of Child Health and Human Development, the study involved almost 800 women who'd had at least one miscarriage and then became pregnant again

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    NEWSLETTERS

    New study finds women are much less likely to lose their pregnancy when they have nausea and vomiting. (Published Tuesday, Sept. 27, 2016)

    It's dreaded by moms-to-be but morning sickness is actually a good sign — for the baby, a government study shows, confirming common pregnancy lore and less rigorous research.

    Women with nausea early in pregnancy were half as likely to have miscarriages and stillbirths as those who sailed through the first few months. Miscarriages were also less common in women who had nausea plus vomiting, although the benefit was stronger for those who just had nausea. 

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    Led by researchers at the National Institute of Child Health and Human Development, the study involved almost 800 women who'd had at least one miscarriage and then became pregnant again. They were asked to record symptoms in daily diaries for the first eight weeks of pregnancy and in monthly questionnaires through the end of the first trimester.

    Stefanie Hinkle, the lead author and a researcher at the national institute, called it the most rigorous study to date on the topic, but also noted that it's unclear if the results would apply to first-time pregnancies. 

    Results were published Monday in JAMA Internal Medicine . 

    THE NUMBERS 

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    There were 188 miscarriages and stillbirths, affecting almost 1 in 4 pregnancies, which is similar to national estimates. More than 90 per cent occurred in the first trimester. 

    Of the nearly 800 women in the study, 443 completed daily diaries, and just over half of them reported nausea by the eighth week of pregnancy, also similar to national estimates. About one in four had nausea and vomiting. The researchers then used statistical analyses to calculate that nausea alone, or nausea with vomiting, was linked with a 50 per cent to 75 per cent reduction in the risk of pregnancy loss.

    STUDY STRENGTHS 

    Unlike some previous studies linking morning sickness with fewer miscarriages, the new research had data on women even before they became pregnant, so they were able to include miscarriages that occurred soon after conception. Some previous studies asked women months later to recall whether they had morning sickness — a weaker method than using daily diaries. 

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    THE REASONS 

    Causes of morning sickness are uncertain but it has been linked with high hormone levels that occur early in pregnancy. How it might reduce chances for miscarriages is also uncertain. Theories include the idea that nausea could make women avoid potentially harmful substances, including bacteria-contaminated food, which can increase risks for miscarriages. 

    THE BOTTOM LINE 

    Hinkle said the results should be reassuring to women concerned that morning sickness could be harmful. But she said unaffected women shouldn't be alarmed.

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    "Every pregnancy is different and just because they don't have symptoms doesn't mean they're going to have a pregnancy loss," Hinkle said.