Embryonic development review (article) | Khan Academy
https://www.khanacademy.org/science/how-does-the-human-body-work-class-12/x7babbc170453fdb8:human-reproduction/x7babbc170453fdb8:fertilization-pregnancy-and-embryonic-development/a/embryonic-development-review
WEB: Organs start to develop, the heart forms and begins to pump blood. By week 8. :The fetus develops limbs and digits by the second month. By week 12. (1st trimester) : Most major organs are formed, external genitalia visible. By week 20. : The mother begins to feel the first movements of the fetus. Hair appears on top of the head. By week 24.
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