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。
Fetuses also experience REM sleep. Studies using ultrasound have shown that fetuses exhibit REM sleep as early as the 23rd week of gestation.
胎儿同样可以检测到快动期。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。
I always go there once about one week. My aunt is in the gestation. Next month, the little baby likes me will be born soon.
我舅妈怀孕了，就在下个月，一个像我一样的小不点很快就要出生了。
Mothers reported their smoking habits at the 17th week of gestation and their child's externalizing behavior at 18 months of age by means of standardized questionnaires.
这些母亲报道其怀孕第17周时的吸烟习惯，在其孩子18月龄时通过标准化问卷评价表面化行为。
ConclusionFetal DNA in maternal plasma can be detected in different gestational stages. The detection rates of fetal DNA in maternal plasma increase with the week of gestation.
结论在不同的妊娠阶段都可检测到孕妇血浆中的胎儿dna，胎儿dna检出率随孕周的增加增高。
Abstract Recurrent spontaneous abortion (RSA) is defined as three or more consecutive pregnancy losses prior to the 20th week of gestation.
复发性自然流产(rsa)的定义是连续3次或以上在妊娠20周前发生妊娠的终止。
Nasal bone lengths were converted to "multiples of the median" (MoM) with adjustment for maternal race and ethnicity and week of gestation.
鼻骨长度被转换成受母性种源、人种和妊娠周数影响的一个中位倍数(MoM)。
Nasal bone lengths were converted to "multiples of the median" (MoM) with adjustment for maternal race and ethnicity and week of gestation.
鼻骨长度被转换成受母性种源、人种和妊娠周数影响的一个中位倍数(MoM)。
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