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18 WEEKS
6 1/4 inches - 12 ounces
 

Week 18 All organs and structures have been formed, and a period of simple growth begins.

The skin is covered with vernix - a greasy material that protects the skin.

Respiratory movements occur, but the lungs have not developed enough to permit survival outside the uterus.
 

Previous  -  Next - Fetal Development - 20 Weeks
 

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