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懷孕2個月胎兒有多大 看看胚胎器官形成期胎兒變化(2)

出處：媽媽育兒網 日期：2017-01-12 11:56:31 編輯：七七

懷孕第2個月的最后寶寶臉部初步象人了。

懷孕第兩個月胚胎會自發(fā)地運動，不過距離您能夠感知的胎動還有很長時間，但此時，做B超可見胎囊約占官腔1/2，胎兒形態(tài)及胎動清楚可見，并可看見卵黃囊。此時B超的胎動是可見的，但是矩離您能感覺到身體里寶寶在動的那種胎動還得很久。

孕5周

胚泡在子宮內著床后，就會向四周擴展，分化形成胚胎原始內胚層、原始外胚層。原始內、外兩胚層是呈現出圓盤狀，稱為胚盤，胚盤長約2毫米。

經過一段時間的發(fā)育，到4周末時在胚盤內、外兩胚層之間，由外胚層分化出一層細胞，形成胚內中胚層。

到現在為止，三胚層就形成了，三胚層是胎體發(fā)育的始基。此時，小胚胎大約長0.6厘米，大小像蘋果籽一樣，外觀很像個"小海馬"。

注意：

在第4-5周，心臟、血管系統最敏感，最容易受到損傷，這個階段禁止接觸X光及其它射線。

懷孕第6周后

胚胎正在迅速地成長，他(她)的心臟已經開始劃分心室，并進行有規(guī)律的跳動及開始供血。胚胎的長度有0.6厘米，像一顆小蘋果籽，這周的細胞還在迅速地分裂。主要器官包括初級的腎和心臟的雛形都已發(fā)育，神經管開始連接大腦和脊髓，原腸也開始發(fā)育。

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