jundu 发表于 12-10-2012 10:56 AM ![](static/image/common/back.gif)
好奇一问。
高龄产妇就有怀唐氏儿的风险 ??
女人的卵子,在胎儿形成的时候也在形成。
你认为它们的年龄有多长?卵子的年龄和男人的精子完全不一样。
A human female typically has about 400,000 follicles/potential eggs, all formed before birth. http://www.drstandley.com/bodysystems_femalerepro.shtml
What is the Risk for Down Syndrome?Some parents have a greater risk of having a baby with Down syndrome. The risk factors include:
Maternal AgeAs a woman’s eggs age, there is a higher risk of the chromosomes dividing incorrectly. Therefore the risk of Down syndrome increases with a woman’s age.
Mother’s age | Chances of having child with Down syndrome | 20 | 1 in 1,600 | 25 | 1 in 1,300 | 30 | 1 in 1,000 | 35 | 1 in 365 | 40 | 1 in 90 | 45 | 1 in 30
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