Around the five-week mark, your baby's heart will begin to beat.

大約五週左右，寶寶的心臟開始跳動。

At 27 weeks, they'll have regular sleep and wake cycles.

在 27 周時，他們會有規律的睡眠和覺醒週期。

And at 39 weeks, your baby will be physically developed.

到 39 周時，寶寶的身體已經發育成熟。

Use this timeline to learn how your baby is developing throughout the pregnancy.

利用此時間表瞭解寶寶在整個孕期的發育情況。

For the first few weeks of what is counted as your pregnancy, you're not pregnant yet.

在算作懷孕的前幾周，你還沒有懷孕。

This is the time between the first day of your last period and when you ovulate and conceive.

這是指從末次月經第一天到排卵受孕之間的時間。

Over the next several days, the fertilized egg will start dividing into multiple cells as it travels down the fallopian tube, enters your uterus, and burrows into the uterine lining.

在接下來的幾天裡，受精卵將開始分裂成多個細胞，並沿著輸卵管進入子宮，鑽入子宮內膜。

You're now about four weeks from the beginning of your last period.

現在距離末次月經開始還有四周左右。

This ball of cells, called a blastocyst, has begun to produce the pregnancy hormone HCG.

這個被稱為囊胚的細胞球已經開始分泌妊娠荷爾蒙 HCG。

This hormone tells your ovaries to stop releasing eggs and can be detected by a pregnancy test.

這種激素會讓您的卵巢停止排卵，可以通過驗孕棒檢測出來。

A mere 16 days after conception, your fetus's neural plate forms.

受孕僅 16 天后，胎兒的神經板就會形成。

Think of it as the foundation of your baby's brain and spinal cord.

將其視為寶寶大腦和脊髓的基礎。

The neural plate folds onto itself to form the neural tube, which closes by about week six of pregnancy to eventually become the brain and spinal cord.

神經板摺疊在一起形成神經管，神經管在懷孕第 6 周左右閉合，最終形成大腦和脊髓。

Folic acid is one of the B vitamins that help form this neural tube.

葉酸是幫助形成神經管的 B 族維生素之一。

Because your baby's nervous system starts developing right out of the gate, it's important to consume 400 micrograms of folic acid daily before getting pregnant, and up that amount to 600 micrograms once you do.

由於寶寶的神經系統從一出生就開始發育，是以在懷孕前每天攝入 400 微克葉酸非常重要，一旦懷孕，攝入量應增加到 600 微克。

This can reduce certain defects of the brain and spinal cord by more than 70%.

這可以將大腦和脊髓的某些缺陷減少 70% 以上。

At two months pregnant, the cluster of cells that will become your baby's heart has begun to develop and pulse.

懷孕兩個月時，將成為胎兒心臟的細胞團已開始發育和搏動。

Your baby's face and buds, which will eventually be limbs, begin to develop.

寶寶的臉部和蓓蕾開始發育，最終成為四肢。

Organs such as the brain, sensory organs, and the digestive tract begin to take shape.

大腦、感覺器官和消化道等器官開始成形。

Your baby has what looks like a little tail.

你的寶寶看起來像一條小尾巴。

It will recede after a few weeks and form the tailbone.

幾周後，它就會消退，形成尾骨。

At three months pregnant, the embryo already has a human appearance.

懷孕三個月時，胚胎已經有了人類的外表。

The limbs, hands, feet, fingers, and toes are recognizable.

四肢、手、腳、手指和腳趾都可以辨認。

Their skin is so thin that you can see the blood vessels beneath it.

它們的皮膚非常薄，可以看到下面的血管。

Though reproductive organs have begun to form, they can't yet be determined on an ultrasound or sonogram.

雖然生殖器官已經開始形成，但還不能通過超音波或聲波圖確定。

By the end of the third month, your baby is fully formed.

到第三個月末，寶寶已經完全成型。

They weigh about an ounce and are four inches long.

它們重約一盎司，長四英寸。

Since your baby's most critical development has occurred, your chance of miscarriage drops considerably after three months into the pregnancy.

由於胎兒最關鍵的發育已經完成，懷孕三個月後流產的機率會大大降低。

During the second trimester, very fine wisps of hair appear on your baby's body.

在懷孕的第二個三個月，寶寶身上會出現一縷縷非常細的毛髮。

This is called lanugo and plays a critical role in protecting the fetus from damaging substances found in amniotic fluid.

這種物質被稱為羊水，在保護胎兒免受羊水中有害物質的傷害方面發揮著至關重要的作用。

Your baby's senses—smell, vision, touch, taste, and hearing—are developing, and they may be able to hear your voice.

寶寶的感官--嗅覺、視覺、觸覺、味覺和聽覺--正在發育，他們可能能聽到您的聲音。

Your baby's eyelids are still fused shut, but they can sense light.

寶寶的眼瞼仍然閉合，但可以感知光線。

If you shine a flashlight on your tummy, they'll move away from the beam.

如果用手電筒照你的肚子，它們就會遠離光束。

Their movements have gone from flutters to full-on kicks and jabs against the walls of your womb.

它們的動作從翩翩起舞變成了對著你的子宮壁拳打腳踢。

Ultrasounds done at four months pregnant may reveal your baby's sex.

懷孕四個月時進行的超音波檢查可能會顯示胎兒的性別。

Here you are in your seventh month of pregnancy.

現在是您懷孕的第七個月。

You've come a long way.

你已經走了很長的路。

During the third trimester, your fetus continues to grow in size and weight.

懷孕三個月期間，胎兒的體積和重量會繼續增長。

Your baby's lungs are beginning to reach maturity, meaning your baby would have a good chance of surviving if born now.

寶寶的肺部開始發育成熟，這意味著如果現在出生，寶寶的存活率會很高。

Starting in week 36, your baby gains about half a pound and grows half an inch a week.

從第 36 周開始，寶寶的體重每週會增加半磅，身高增長半英寸。

Many babies turn head down and stay in that position until birth.

很多嬰兒會頭朝下，並保持這種姿勢直到出生。

Thank you for watching this video.

感謝您觀看本視頻。

Please watch my other videos if you would like to know what to expect during a vaginal delivery or c-section.

如果您想了解陰道分娩或剖腹產的注意事項，請觀看我的其他視頻。