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A 32-year-old female asked:

What is the size difference of a 9 week old fetus compared to a 12 week old fetus?

1 doctor answer1 doctor weighed in
Dr. Bruce J. Stringer
Radiology 47 years experience
23mm vs 57mm: The crown rump length of a 9 week fetus is 23mm (0.9 in). A 12 week fetus has a crl of 57mm (2.24 in). This does not include the length of the legs which cannot be reliably measured.

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Last updated Jul 22, 2016

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