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早生孩子还是晚生孩子好?

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发表于 2016-3-21 11:16:18 | 显示全部楼层 |阅读模式
早生孩子还是晚生孩子好?
早生孩子还是晚生孩子好?母婴育儿网小编推荐阅读:父母年龄与孩子是否优秀,其实要讨论两个阶段 宁德妇产医院建档攻略,第一个阶段是怀胎十月。关于这方面,前面许多的答案已经说得很完整了,包括怀孕难度增大,流产率增高,唐氏综合症的概率上升等等。应该说,高龄父母,尤其是高龄母亲却是在怀孕生子的整个过程中更坎坷一些 宁德协和妇产医院挂号,面临的风险也更大一些。    但对一个孩子的整个人生来说,在母亲子宫内的十个月仅仅是一个片段。一对二十岁出头的年轻父母和另一对已经进入而立之年的壮年父母,会分别自己的孩子带来什么?我这里要讨论的,就是在孩子出生之后将要发生的事情。    体重    新生儿体重和母亲的年龄一般被认为是存在一个倒U型关系,即随着母亲年龄的上升,新生儿体重先上升后下降,这个拐点一般出现在30-35岁之间 宁德协和妇产医院建档。也就是说,过了30岁再生孩子,孩子的体格可能更大。但从下图可以看到,这个效应不是特别明显,各个年龄段的母亲所生的孩子,刚出生时的体重都是差不多的。    一些朋友可能会觉得,新生儿体重仅仅是一个侧面,也不一定是好事,何况比较重的新生儿可能还需要剖腹产。但事实上我们能发现,30-35岁产妇孩子的体重较高这种现象,不仅在出生时出现,在孩子长大时仍然持续存在,其幅度甚至比出生时更大一些。下图显示,如果同样对比7-8岁的儿童重量,那么母亲生育年龄在33岁的孩子(54.7斤)要比母亲生育年龄仅有16岁的孩子(41.7斤)重整整13斤。而随着母亲生育年龄进一步增加,在生育年龄达到38岁时,7-8岁儿童的体重又回到40斤左右。    对此我们可能仍然有疑问:    首先,体重更重,到底是不是好事?这个问题见仁见智,但对于绝大部分儿童来说,体重过轻一般常常是与「体弱多病」紧紧联系在一起的。    其次,儿童体重的差异,到底是由「新生儿体质」决定的,还是后天养育过程决定的?在体重这个变量上,先天和后天这两种效应很难分开,但分开这两种效应,对我们其实也没有多少帮助——因为这个数据模式本身已经足够有趣,而且即便研究发现后天养育过程对儿童体重的影响很大,我们也很难让一名16岁的母亲按照33岁的母亲的方式来养育孩子。    身高    可能「体重更重」并不是一个十分正面的词汇,但「身高更高」显然就是时下父母的追求了。身高是一个受到父母身高(基因影响)和孩子年龄影响很大的变量,因此,如果我们仅仅将儿童的身高平均,可能得到的是一个混杂了孩子年龄效应与父母身高效应的数据 宁德协和妇产医院市妇幼保健院。我们对身高这个变量做如下处理:    首先,将一个孩子的身高减去该年龄段儿童的平均身高 宁德协和妇产医院专家门诊,即算出这个孩子比同年龄段的孩子高 低几厘米。    其次,用孩子的父母身高来回归身高数值在各个年龄段的离差。    最后,获得第二步回归时不能被父母身高所解释的残差。
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发表于 2016-4-15 13:45:47 | 显示全部楼层

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