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How does a baby develop?
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A baby's life begins when a male sperm joins a female egg inside a woman's body. The sperm joins with the egg to form a single cell, which divides to make more cells. After about a week, it has multiplied to become more than 100 cells. The developing baby is called a foetus. After two weeks blood cells start to form, and after four weeks the heart is beating. At eight weeks, the foetus is about 4 centimetres long and has all the major organs. After nine months the baby is ready to be born. | | Inside the womb the baby is surrounded by fluid. This allows it to grow without being jarred by the mother's organs. |
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Previous:
Back
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Book:
1001
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Section:
Human World
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Chapter:
Human Body: Systems
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