That's a huge milestone in fetal development.

这是胚胎发育中的重要里程碑。

Remember how prostaglandin E2 keeps the ductus arteriosus open during fetal development?

还记得是前列腺素E2使动脉导管在胎儿发育期开放吗？

Exposure to radiation and infection during fetal development can cause cerebral palsy.

在胎儿发育期间暴露于辐射和感染，可以引起脑瘫。

Normally, during fetal development there's a region of the brain called the olfactory placode.

正常情况下，在胎儿发育期间，大脑中有一个区域被称为嗅觉基板。

Ayla received six treatments every two weeks, starting at about 24 weeks of fetal development.

艾拉每两周接受六次治疗，从胎儿发育约24周开始。

During fetal development, the entire body derives from three layers, called germ layers, the ectoderm, mesoderm, and endoderm.

胚胎发育过程由三个胚层组成，分别是：外胚层、中胚层与内胚层。

Moreover, some DNA alterations can occur in white blood cells during fetal development, further increasing the risk of early leukemia.

此外，白细胞中某些DNA改变在胎儿时期就能发生，所以增加了早期患白血病的风险。

These include Kallmann syndrome, where GnRH producing neurons fail to migrate from the nose region to the hypothalamus during fetal development.

这包括Kallmann综合征，即制造GnRH的神经元在胚胎发育时未能从鼻区域迁移至下丘脑。

They might have kidney issues, specifically a congenital abnormality called horseshoe kidney where the two kidneys become fused during fetal development.

她们可能有肾脏问题，特别是一种称为马蹄肾的先天性畸形，由胎儿发育过程中两个肾脏融合在一起而造成。

As mini brains grow, they follow all the steps of fetal brain development.

随着迷你大脑的成长，它们遵循胎儿大脑发育的所有步骤。

Animal studies have linked BPA to all sorts of problems, like decreased fertility, impaired fetal development, obesity, and cardiovascular diseases.

动物研究已将 BPA 与各种问题联系起来，例如生育能力下降、胎儿发育受损、肥胖和心血管疾病。

Now, the exact cause of all three types of spina bifida isn't known, but there are known risk factors like folate or Vitamin B9 deficiency during fetal development.

这三种脊柱裂的确切病因尚不清楚，但也有已知的风险因素，如胎儿发育期间缺乏叶酸（维生素B9）。

In fetal development, the ductus arteriosus is kept open by high levels of a vasodilator prostaglandin E2 which is made by the placenta and by the ductus arteriosus itself.

在胎儿发育期，动脉导管开放是由于一种高浓度的血管扩张剂前列腺素E2，由胎盘和动脉导管自身分泌。

Very early on in fetal development, the ectoderm which is the outer layer of the fertilized egg starts to develop a bit of a ridge that eventually becomes the neural tube.

在胎儿发育的早期，受精卵的外层，即外胚层，开始形成脊状突起，最后形成神经管。

Well during fetal development, there are cells called neural crest cells, which are basically a group of fetal cells that migrate away and differentiate into a variety of different cell types.

在胎儿发育过程中，有一种细胞叫做神经嵴细胞，是一组由胎儿细胞迁移并分化成各种不同类型的细胞。

Phthalates, used to make plastic soft and flexible, are associated with adverse effects on fetal development and reproductive problems in adults along with insulin resistance and obesity.

邻苯二甲酸盐用于使塑料变得柔软和有弹性，会对胎儿发育和成人生殖问题以及胰岛素抵抗和肥胖产生不利影响。

In humans, mercury can lead to neurological disorders. Children who are exposed to mercury during fetal development and childhood have a greater risk of poor performance on tests that measure attention, IQ, fine motor function and language.

对于人类来说，汞会导致神经系统紊乱。 在胎儿发育和童年时期接触过汞的儿童，在注意力、智商、精细运动功能和语言能力的测试上表现较差的风险更大。

It is found more often in boys than in girls. A third type of dyslexia is referred to as secondary or developmental dyslexia and is felt to be caused by hormonal development during the early stages of fetal development.

它在男孩中比在女孩中更常见。第三种类型的阅读障碍被称为继发性或发育性阅读障碍，被认为是由胎儿发育早期的荷尔蒙发育引起的。

During fetal development, when the interatrial septum is being formed, a small passageway called the " foramen ovale" is left open to allow the blood to bypass the non-functional fetal lungs while the fetus obtains oxygen from the mother's placenta.

在胎儿时期，当房间隔正在形成时，残留下一个被称之为为“卵圆孔”的细小通道，允许血液绕过无功能的胎儿肺，而胎儿是从母亲的胎盘获得氧气。