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![](http://upload.wikimedia.org/wikipedia/commons/a/aa/6_weeks_pregnant.png)
This is a picture of a human fetus at 6 weeks' gestational age (i.e. 4 weeks after fertilization).
Photo credit: The present image (without watermark) was donated by Wouter Vergeer <[email protected]> on Wednesday, August 29, 2007 on behalf of 3DPregnancy.com.