As you will recall, a developing human is called a fetus from the ninth week of gestation until birth. This 30-week period of development is marked by continued cell growth and differentiation, which fully develop the structures and functions of the immature organ systems formed during the embryonic period.
This highly educational 3D documentary vividly portrays the development of new human life over the course of pregnancy with a combination of exquisite animation and real footage. The amazing trek of 300 million sperm toward the mother’s egg and the weekly development of a fetus’s hair and skin shouldn’t be missed.
Pregnancy is usually measured from the date of the beginning of the last period, and the egg is fertilised about 2 weeks after that. So although pregnancy is said to last for 40 weeks gestation, for the first 2 weeks of the 40 weeks of pregnancy there is nothing there.