由于每对夫妇只生一个小孩,相对地增加了大家害怕生一个不正常的孩子的顾虑。谈畸形色变的情况也越来越多。为了解除一些不必要的顾虑,使孕妇能有一个良好的身心状态,这里简单谈谈胎儿发育知识以及先天畸形是怎样发生的,应该如何预防。胎儿在母体内孕育四十周。这四十周可以分为两个阶段,第一阶段是从闭经到第十周,实际也就是受孕后的前八周。在这八周内,一个受精卵细胞将逐渐发育成一个初具人形,手足、内脏俱全的小胎儿。这个小胎儿顶臀长度不过一寸多,体重不过几克,但是这个时期是胎儿发育正常与否的最关健的时期,如果 Since each couple has only one child, this increases the relative fear of being afraid of giving birth to an abnormal child. Talk about abnormal color change is also more and more. In order to relieve some unnecessary concerns, so that pregnant women can have a good physical and mental state, here simply talk about fetal development and congenital malformations happen, how to prevent. Fetus in the mother’s body for 40 weeks. This fortieth week can be divided into two stages, the first stage is from amenorrhea to the tenth week, the actual is the first eight weeks after conception. Within these eight weeks, a fertilized egg cell will gradually develop into a human fetus, hand, foot and internal organs. The little fetus buttock length of more than an inch, but a few grams of body weight, but this period is normal fetal development or not the most crucial period, if