A member asked:

Had a ultrasound at 17w4d pregnant, baby measured 17w0d. everything else looked perfect. is this variation commom in us?all 3 anterior were on target.

3 doctors weighed in across 2 answers
Dr. Bruce J. Stringer answered

Specializes in Radiology

Yes: There is a fairly wide variation in fetal size as the pregnancy progresses that reflects the fact that some normal babies will weigh 6 lbs. At birth and others 9 lbs. The thing we look for is appropriate growth of the fetus on its' curve.

Answered 11/23/2013

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Dr. Neil Lall answered

Yes: There is variation in these dates estimates, and remember that they are only estimates. Also, the earlier estimates are usually the most accurate, with accuracy decreasing as the fetus gets older.

Answered 8/10/2015

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