The baby's arms, hands, feet, fingers, toes, and the eternal are fully developed. The baby is able to open and close its fists and mouth. Fingernails, toenails, and the beginnings of teeth are beginning to form. Reproductive organs start to form, but the gender is still hard to determine through an ultrasound. Bile is produced because the circulatory and urinary systems are working. By the end of the month is the baby is fully formed and all the organs and extremities and organs are present and will continue to form. The baby is about 4 inches long.