In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:
Eyelids and eyelashes are formed
Most of the major organ systems are formed
The head is covered with fine hair
Movement of the fetus
According to the text, 'By the end of 12 weeks (first trimester), most of the major organ systems are formed, for example, the limbs and external genital organs are well-developed'. In contrast, the first movements of the fetus and appearance of hair on the head are observed during the fifth month, and eyelids separate and eyelashes form by the end of 24 weeks.
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