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Eight week old foetus. Side view of an 8-week-old human foetus surrounded by its amnion membrane. The foetus measures 20mm from crown to rump. The eye (small dark spot) is visible on the head (at top). The umbilical cord (at left) would in life link the foetus to the placenta. Most organs have developed but require growth. After the eighth week the embryo becomes a foetus.
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