All the body systems are functioning by twelve weeks. 4 Months Baby can grasp with the hands, swim and turn somersaults. Mother may first feel baby's movements. 5 Months Baby responds to sounds that are of frequencies that exceed adult's range in both directions. Fine hair grows on head and eyebrows.
Tiny eyelashes appear.
In the final six weeks of gestation, the baby gains about an ounce of weight per day. Hormones released by the child trigger labor. Other Interesting Developments in the unborn child At 8 weeks - Stomach produces digestive juices, a tapping stimulus on the amniotic sac leads the baby to move his arms. The baby now has about one billion cells and contains more genetic information than every word communicated by every human being who has ever lived since the beginning of the race. At 9 weeks - The child bends his fingers around an object.