Zoology - Human Reproduction Question with Solution | TestHub

In human beings, after one month of pregnancy, the embryo's  heart is formed. By the end of the second month of pregnancy, the foetus develops limbs & digits. By the end of 12 weeks (first trimester), most of the major organ systems are formed. The first movements of the foetus & appearance of hair on the head are usually observed during the fifth month. By the end of 24 weeks (second trimester), the body is covered with fine hair, eye-lids separate, and eyelashes are formed. By the end of nine months of pregnancy, the foetus is fully developed and is ready for delivery.