New Guidelines For Estimating Women's Due Dates Issued By OB. Babies have a gestational period of about 280 days, so count back 3 months from the first day of your last period and add 7 more days. Thus, having accurate and consistent dating is important.". Women are traditionally told their due date is 280 days, or 40 weeks, after the first. the woman's providers should change her due date to reflect her ultrasound.
Wrong due date from ultrasound scan - why it happens. " can really be answered by only one person: Your baby. Can your pregnancy scan give the wrong due date. try and stick with the date that you're given at your dating scan, it can and does change.
Ask the midwife I am confused about my due date - Kidspot Your approximate due date is that day within the next year. If we use an ultrasound for dating a pregnancy, we only ever use the very first pregnancy ultrasound for dating purposes. Subsequent ultrasounds do not change.
Dating ultrasound change due date:
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