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In the very early weeks, the developing baby is called an embryo. Then, from about eight weeks onward, it is called a fetus, meaning 'young one'.
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0 - 8 Weeks

About 2.5cm long (crown to rump)
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8 - 12 Weeks

About 9cm long
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12 - 16 Weeks

About 13.5cm long
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20 - 24 Weeks

About 26cm long
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24 - 28 Weeks

About 28cm long
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28 - 32 Weeks

About 32cm long
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32 - 36 Weeks

About 36cm long
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