精子與卵子的結合

前九週的生長過程  http://www.babycenter.com/2_inside-pregnancy-labor-and-birth_3658872.bc

第十周到第十四週的生長過程  http://www.babycenter.com/2_inside-pregnancy-labor-and-birth_3658872.bc

第十五周到第二十週的生長過程  http://www.babycenter.com/2_inside-pregnancy-labor-and-birth_3658872.bc

第二十八周到第三十七周的生長過程 http://www.babycenter.com/2_inside-pregnancy-labor-and-birth_3658872.bc

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