Pregnancy dating scans how accurate

Most babies, except in cases of early IUGR and deformities, grow about the same until 20 weeks or so.

Two ultrasounds taken one month apart that agree with each other on when the due date is, yield a very accurate and reliable answer.In early pregnancy, the measurement from the top of the fetal head to the bottom of the pelvis is called the “Crown-Rump” length.Before twelve weeks, it’s difficult to measure much more. In the second trimester, (past the first 12 weeks), the other measurements can be added.Your Facebook name, profile photo and other personal information you make public on Facebook (e.g., school, work, current city, age) will appear with your comment. Any time someone says you're X weeks pregnant, the baby's been in there for X-2.The most accurate time to date you pregnancy is after 8 weeks through to 13.

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