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Appendix 1
The Chronological Development of The Unborn Child
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Thirteenth Week
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Timing
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Source |
Respiratory movements can transport
amniotic fluid in and out of the respiratory tract.
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Beginning of the 4th month |
Williams, p 177 |
| Eyebrows are present. |
13th week after fertilization |
England, p 209 |
| The fetus can accomplish a complete
change in position, usually with a backwards somersault. |
By 13th week after conception |
de Vries (1982), p 301 & p 309 |
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