HELENE FOURNIE, ISM / SCIENCE PHOTO LIBRARY HELENE FOURNIE, ISM / SCIENCE PHOTO LIBRARY
Four-month-old foetus. Illustration of a 4-month-old human foetus in its amniotic sac, with the umbilical cord and placenta (left) also visible. In humans, the foetus develops for around 9 months, and is born after around 38 weeks of development in its mother's uterus.
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