Fhe Fetus, when the wonderful life begin

Fhe Fetus, when the wonderful life begin.

In humans, the fetal stage starts nine weeks after fertilization. At the start of the fetal stage, the fetus is typically about 30 millimetres (1.2 in) in length from crown-rump, and weighs about 8 grams. The head makes up nearly half of the size of the fetus. Breathing-like movements of the fetus are necessary for the stimulation of lung development, rather than for obtaining oxygen. The heart, hands, feet, brain and other organs are present, but are only at the beginning of development and have minimal operation. The genitalia of the fetus starts to form and placenta becomes fully functional during week 9.

At this point in development, uncontrolled movements and twitches occur as muscles, the brain, and pathways begin to develop.