During week 19 of pregnancy, the fetus may be able to hear her mother's voice, according to BabyCenter. The brain is processing sight, smell, taste, hearing and touch. The fetus' hair continues to grow, and her limbs are now proportional to her body. During this time, the vernix caseosa, a waxy coating forms on her skin to protect it from being pickled in the amniotic fluid.
At week 19, the fetus weighs about 8 1/2 ounces and is about 6 inches long, and the pregnant woman begins to experience some changes. BabyCenter states that the pregnant woman may begin to feel sharp, stabbing sensations in the lower abdomen related to round-ligament pain. The pain occurs as the belly begins to grow to accommodate the growing fetus.
The expectant mother's skin may begin to change during week 19 as well, notes BabyCenter. Cholasma, also known as the pregnancy mask, leaves hyperpigmented skin on the forehead and cheeks. A woman may notice her freckles, nipples, underarms, inner thighs, scars and vulva darkening too. The linea negra may form from the belly button to the pelvic bone during this time in the pregnancy. The extra estrogen in the body may cause a pregnant woman's palms to turn red.