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懷孕5個月胎兒有多大？胎兒發(fā)育完全了嗎?

出處：媽媽育兒網(wǎng) 日期：2020-12-02 11:36:23 編輯：Limbo
孕媽們都要懷胎十月才能生下健康的寶寶，那么懷孕5個月胎兒有多大？胎兒發(fā)育完全了嗎?下面的內(nèi)容一起來看看吧！

懷孕5個月胎兒有多大？

        1、懷孕五個月是指孕17～20周，這個星期進入了胎寶寶發(fā)育的關(guān)鍵期，循環(huán)系統(tǒng)、尿道等也開始工作。懷孕17~20周，孕媽媽可以第一次感覺到胎動，也許就在這一周你開始感覺到胎動。這個時候是進行胎教的好機會。此外，飲食、保健等方面都要做好。
         2、這個時候的胎兒身高20~25厘米，體重250~300克，全身長出細毛(毳毛)，開始長頭發(fā)，眉毛、指甲等也出齊。頭的大小像個雞蛋，頭重腳輕的身體分成三部分，身體比例終于顯得勻稱，皮膚漸漸顯現(xiàn)出紅色，皮下脂肪開始沉著，皮膚不透明了。
        3、胎兒的心跳十分活躍，在羊水中胎兒的手腳可以自由地活動。5個月的第一周：胎兒大小約為14cm，胎兒體重約200克;5個月的第二周：胎兒大小約為15cm，胎兒體重為200--250克;5個月的第三周：胎兒大小約為15--16cm，胎兒體重約260克;5個月的第四周：胎兒大小約18cm，胎兒體重300--350克;
         4、5個月里面的最后一周：胎兒大小約19cm，胎兒體重約350克。此段時期正常胎兒的心跳逐漸有力，胎心率每分鐘120～160次，18周后用聽診器在母親腹壁可聽到胎心;同時胎兒也能聽到外界較強的聲音;可進行胎教。此期，正常胎兒身長約18-27厘米，體重約250～300克。這時胎兒已經(jīng)具有了吞咽及排尿功能。　　

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