DAVID GIFFORD / SCIENCE PHOTO LIBRARY DAVID GIFFORD / SCIENCE PHOTO LIBRARY
Foetus. Artwork of a 33 week-old foetus in the womb. At this stage of a pregnancy an average foetus weighs about 1.6kg and is about 40cm in length. It's internal organs are almost fully mature and it is perfectly formed. The head of the foetus is seen in the normal birth position, facing the cervical canal (at bottom of image). At labour the cervical canal widens up to 10cm in diameter to allow the baby to pass into the vaginal canal. Between 8 weeks and full term (about 40 weeks) a foetus will increase in length by 20 times and in weight by about 1,700 times.
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