17 weeks...

Your Baby: More Than Meets The Eye
If you saw an ultrasound of your fetus right now, you'd spot a number of recognizable features. Your baby-to-be has thin eyebrows, hair on his scalp, and well-developed limbs. He's mastered a few simple reflexes, too -- sucking, swallowing, and blinking. Head to rump, the fetus measures 5 inches (12.7 cm) long and weighs approximately 6 ounces (170 g). Underneath the baby's skin, fat is forming. By the end of your pregnancy, this fat will account for 2% to 6% of the baby's weight and help maintain his body temperature at birth. At this age, your baby's hearing is pretty sharp. He can make out your conversations and may even be startled by loud noises! Whether you feel it or not, your baby is becoming very active, moving his head, arms, and legs, and making breathing movements.