Articles
Fetal development: The 2nd trimester
Content
Week 13: Urine forms
Week 14: Baby's sex becoming apparent
Week 15: Baby's scalp pattern develops
Week 16: Baby's eyes move
Week 17: Baby's toenails develop
Week 18: Baby begins to hear
Week 19: Baby develops protective coating
Week 20: The halfway point
Week 21: Baby can suck his or her thumb
Week 22: Baby's hair becomes visible
Week 23: Fingerprints and footprints form
Week 24: Baby's skin is wrinkled
Week 25: Baby responds to your voice
Week 26: Baby's lungs develop
Week 27: 2nd trimester ends
Week 18: Baby begins to hear
Eighteen weeks into your pregnancy, or 16 weeks after conception, your baby's ears begin to stand out on the sides of his or her head. Your baby might begin to hear sounds. The eyes are beginning to face forward. Your baby's digestive system has started working.
By now your baby might be 5 1/2 inches (140 millimeters) long from crown to rump and weigh 7 ounces (200 grams).
