The muscles begin to develop and sex organs form. Eyelids, fingernails, and toenails also form. The child's spontaneous movements can be observed. Week 18-The fetus is now about 5 inches long. The child blinks, grasps, and moves her mouth.
Hair grows on the head and body.
Sweat glands develop, and the external skin has turned from transparent to opaque. Week 26-The fetus can now inhale, exhale and even cry. Eyes have completely formed, and the tongue has developed taste buds. Week 30-The fetus is usually capable of living outside the womb and would be considered premature at birth. Week 40-This marks the end of the normal gestational period.