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27) in the BJOG: An International Journal of Obstetrics and Gynecology.In late pregnancy, as the body prepares for labor, the cervix — a cone-shaped organ that sits between the uterus and the vagina — begins to flatten out.Better medical planning Estimating due dates more closely could help doctors make medical decisions.For babies with congenital anomalies who must be delivered in a hospital, getting a better estimate of the due date could ensure safer delivery.And pregnant women who already have other children often scramble to find child care during labor.But there haven't been reliable methods to tell a woman exactly when her baby is coming.He found that among the women whose cervix was more than 1.18 inches (3 cm) long at the time it was measured, less than 50 percent of these women delivered within a week.

5 ½ weeks gestation means 5 ½ weeks from the first day of the last menstrual period, which is usually about 3 ½ weeks from the date of conception (confusing, isn’t it!And during labor, the cervix thins down, or effaces completely, and then opens to allow the baby's head to come out.[7 Facts Women and Men Should Know About the Vagina]"The beginning of changes in the cervix happen internally, not externally," Berghella told Live Science.A healthy pregnancy is, on average, 40 weeks from the last menstrual period, but in reality, most babies come sometime between 37 and 42 weeks gestation.For many women, that five-week window creates a waiting game that can feel unbearable.

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    This method of creating an Excel data validation list takes a bit more time, but it may save even more time in the long run.