Uterine and vaginal infections: Infections - both those in the genital tract, such as bacterial vaginosis (BV) and sexually transmitted diseases (STDs) like trichomoniasis, along with infections in the uterus and amniotic fluid - are thought to be responsible for nearly half of all preterm births.And the longer you can wait, the less you’re at risk: A large recent study found that 20 percent of women who wait less than a year between pregnancies give birth before 37 weeks the rate drops to 10 percent among women who wait a year to 18 months and is less than 8 percent in those who wait more than 18 months to conceive again. Short interval between pregnancies: Getting pregnant sooner than 18 months after giving birth to your last child increases your risk of preterm birth.If there’s ever a reason to quit, pregnancy is it. Smoking, alcohol and drug use: Not only do these increase your risk of miscarriage, they also increase your baby’s risk of being born early or at a low birth weight (toxins that cross the placenta can keep your baby from getting the necessary oxygen she needs to grow). While no one knows for sure what causes preterm labor, experts point to a number of factors that could play a role in triggering your uterus to begin contracting and your cervix dilating before your baby is ready to come out: The latest research from the March of Dimes shows that the number of cases of premature labor is on the rise for the fifth year in a row, and around 10 percent of moms find their expected nine months of pregnancy turns into an unexpected seven or eight because they go into labor too soon.
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