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 21: Baby can suck his or her thumb
Twenty-one weeks into your pregnancy, or 19 weeks after conception, your baby is completely covered with a fine, downy hair called lanugo. The lanugo helps hold the vernix caseosa on the skin.
The sucking reflex also is developing, enabling your baby to suck his or her thumb.
