Are early ultrasounds (6ws) more accurate on EDD??

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Idk mines have been very consitant with my 6 week one every measurement

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My OB told me with my first they best time frame is 6-10 weeks, as the baby grows at the same rate.

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I had an early ultrasound around 6.5 weeks and my OB asked for another one at 12 weeks stating the earlier one wasn’t accurate. He said the best time for accuracy is between 8-12 weeks.  The first early ultrasound had been a week off.

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Usually the EDD set at the ultrasounds done between 9-12 weeks are the most accurate. Baby’s grow at a very similar rate up until then. After that baby can grow differently than others based on genetic factors.

Are early ultrasounds (6ws) more accurate on EDD??

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