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A 7 week ultrasound would be more accurate than a 13 week one especially if it agreed with your lmp. 13 week babies have plenty of room to move around and sometimes it is more difficult to measure accurately.

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โˆ™ 2006-09-13 07:00:14
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Q: Ultrasound at 7w3d baby measured right on that date However ultrasound at 13w3d baby measured 10 days larger LMP only lasted 2 days and was super light What would be your explanation?
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