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Do they add two weeks to the baby's gestational age in ultrasounds?

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Ultrasounds performed after 22 weeks gestation cannot be used to estimate the due date of the baby because the size no longer reflects the age very well. Even average babies can differ by up to 2 to 3 " weeks of growth";. These scans are only used to estimate the due date of your baby if this is all you have to go on.
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