Can 12 week dating scan wrong
) the fetus is clearly seen on trans-vaginal ultrasound and the heart beat can be seen at this early stage (90 to 110 beats per minute under 6 to 7 weeks, then 110 to 200 beats per minute as the baby matures).the baby and its heart beat can be detected relatively easily with trans-abdominal and trans-vaginal examination.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.Cervical checks, in which a doctor manually feels the length and softness of the cervix with his or her fingers, are typically not very reliable, Berghella said.
Vincenzo Berghella, director of maternal fetal medicine at Thomas Jefferson University Hospital in Philadelphia."This is something that is easily implementable tomorrow if people wanted," Berghella told Live Science.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.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.
And during labor, the cervix thins down, or effaces completely, and then opens to allow the baby's head to come out.