Methods 104 samples of amniotic fluid from pregnant women during 16-29th-week gestation were cultured and karyotyped.
方法抽取104例孕16～29周孕妇的羊水，采用改良的羊水细胞培养方法进行培养。
Studies using ultrasound have shown that fetuses exhibit REM sleep as early as the 23rd week of gestation.
研究者通过超声波发现，23周大的胎儿即开始在睡眠时快速移动眼球。
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.
希巴德博士发现，孕期超过34周后，患并发症的几率逐周下降，40周时，仅有0.3%的婴儿出现呼吸综合症的迹象。
应用推荐