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An expected due date shouldn’t be changed based on measurements from a second or third ultrasound.
Due date estimations are more accurate earlier in pregnancy.
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A repeat ultrasound will provide valuable information about the growth of the fetus and may reassure you and your doctor that the change in due date is reasonable. Ultrasound measurements for estimating the age of a fetus are more accurate during the early stages of pregnancy.
In the first few weeks, fetuses tend to develop at the same rate.
Very few women actually deliver on their due date, so while it’s important to have an idea of when your baby will be born, try not to get too attached to the exact date.
However, as pregnancy progresses, the rates of fetal growth begin to vary from pregnancy to pregnancy.
This is why ultrasound measurements can’t be used to accurately predict the age of the baby in the later stages of pregnancy.
Your doctor may change your due date based on the ultrasound measurement.
This is most likely to occur in the first trimester, especially if the date estimated by the ultrasound differs by more than one week from the date estimated by your doctor based on your LMP.