MEDI-MATION / SCIENCE PHOTO LIBRARY MEDI-MATION / SCIENCE PHOTO LIBRARY
Artwork of a foetus in the womb at the 36th week of pregnancy. The foetus develops within its mother's uterus, surrounded by a fluid-filled amniotic sac. The placenta (not seen) on the uterus wall acts through the umbilical cord (down right), bringing oxygen and nutrition to the developing foetus, and taking away waste products. At the 36th week of pregnancy a normal foetus weighs about 2.5 kilograms and is about 46 centimetres long. The internal organs are usually fully formed by this stage, and the foetus is considered to have reached full term. Birth usually occurs around this time or a few weeks later.
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