Until the eighth week of gestation every human fetal brain looks female .
直到怀孕的第8周,人类胚胎的大脑都看起来像女性的。
Women in the fish-oil group had lower rates of pre-term births , particularly births earlier than 34 weeks of gestation .
食用鱼肝油的那组妇女拥有较低的早产率,尤其是怀孕34周以前的早产。
In the last 3 months of gestation , a fetus 's ears have developed enough to pick up sounds , including its mother 's voice .
在怀孕的最后3个月,胎儿的耳朵已经发育成熟到可以听到一些声音,包括它妈妈的声音。
On this view , twins are probably an accidental by-product of a natural insurance policy against the risk of losing an embryo early in gestation .
基于此观点,双胞胎也许是“自然保险单”针对怀孕前期的流产风险所提供的一份意外副产品。
The new study found that to be reliable , the sex-determination tests had to be performed after at least seven weeks of gestation .
这项新的研究发现,性别检测至少需要在怀孕七周之后进行才会得到可靠地结果。
At many key points of gestation , male and female fetuses are often exposed to similar amounts of testosterone .
在孕期的很多关键时间点,男性和女性胎儿经常会接触到相似量的睾丸酮。
That review-based on more than 20 studies of animals and humans-concluded that vitamin d during gestation and early infancy was essential for " normal brain functioning . "
这个评论基于对二十多例人和动物的研究结论是在孕期和婴儿期维生素d对大脑的正常发育非常重要。
With every week of gestation after 34 weeks , however , hibbard found that rates of complications dropped - by 40 weeks , only 0.3 % of babies showed signs of respiratory distress .
According to conventional wisdom , an embryo becomes a boy when a gene on the y chromosome triggers the development of testes , which then begin to produce male sex hormones , including testosterone , at about the 8th week of gestation .