Describe the 4th month
Sex is now evident. Languo covers the entire body. Yolk sac that will produce blood until the fetus can make its own (the ball in the picture)
Fetus can now hear. 4-6 oz of amniotic fluid surrounds the fetus. Fetus is 5in long, 4oz in weight.
Legs, with their bones seen through translucent skin, are in motion, even though the mother can't feel the movement.