Limbs Arms have almost reached final proportion and length, though legs are still quite short relative to fetus' body. Hands, particularly the thumbs, become more functional. Skin, Muscle, Glands Muscles function more smoothly. Fetus is more flexible and has advanced movements of head, mouth and lips, arms, wrists, hands, legs, foot, and toes. Muscles and nervous system continue to advance.
Sweat glands appear and body hair begins to grow.