人类胚胎发育[1]是指人类胚胎的形成和发育。当精子成功进入卵细胞并与卵细胞融合时，就会出现受精。然后便会形成受精卵，此后便意味着胚胎开始发育。当人类的人类胚胎发育至第九周时，此时的胚胎开始被称为胎儿。胚胎发育的前八周共要经历23个阶段。人类的妊娠期一共要9个月或者40周。
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