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How long after fertilization does a preborn human begin to suck his or her thumb?

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Per the textbook Human Genetics, "By week 12, the fetus sucks its thumb, kicks, makes fists and faces, and has the beginnings of baby teeth." Per the Encyclopedia of Human Biology, "Attempts to suckle have been seen in utero and in aborted fetuses of 3 months."

DocumentationScientific Facts about Abortion




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