Brain structure complete. The head at week 11 is almost half the fetus. With the rapid growth the CRL doubles by week 14 but the head grows more slowly. The neck lengthens and extends so the chin is no longer contacting the body. The eyelids meet, fuse, and the eyes remain closed until week 27.
Fingernails appear on the digits.
The upper limb is disproportionately large. The midgut which was herniated into the umbilical cord returns to the enlarged abdominal cavity at week 12. Bile is secreted. External genitalia appear in week 11 and fully differentiate into male and female by week 14. Kidneys ascend to adult position by 11 weeks.