Appendix 1
The Chronological Development of The Unborn Child


Thirteenth Week



Respiratory movements can transport amniotic fluid in and out of the respiratory tract.
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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