Your little one now weighs about 150-200 grams (5.3-7.0 ounces) and measures around 13.5 cm (5.3 inches) from crown to rump. They are growing rapidly! Fingerprints have fully formed, making your baby officially unique. The baby's chest is moving up and down, mimicking breathing motions, although they are breathing amniotic fluid, not air. If you're having a boy, his genitals are clearly visible and distinct on an ultrasound. If it's a girl, the vagina, uterus, and fallopian tubes are now in place. Your baby can hear your voice, the rumblings of your stomach, and sounds from outside the womb, such as voices and music. The large intestine has been positioned against the back of the abdominal wall, and digestive glands are forming. The developing digestive system has been working for several weeks: the amniotic fluid the fetus swallows combines with dead cells and secretions to form meconium, the greenish-black, tarry substance that will fill your baby's first diaper. The fetus is about 6.5 to 7 inches from top to bottom. Fine hair (lanugo) is starting to appear on the body. Fingerprints and toeprints are forming. The teeth are beginning to form enamel.