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A 32-year-old female asked:

what's the size difference between 14 week and 18 week fetus?

1 doctor answer1 doctor weighed in
Dr. Henry Dorn
Obstetrics and Gynecology 25 years experience
About double: At 14 weeks a fetus is about 3.5" from head to butt, and around 5.5" at 18 weeks, almost twice as long. We don't measure head to toe since they are rarely stretched out like that for more than a moment.

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Last updated Apr 13, 2013
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