thanks a lot!

来源: toploader 于 2009-03-18 05:10:25 [] [博客] [旧帖] [给我悄悄话] 阅读数 : 0 (168 bytes)
回答: 生过孩子的姐妹们来帮看下。 由 不吃人的老虎 于 2009-03-17 14:46:10

Down syndrome (trisomy 21) is the most commonly recognized....

That means down is trisomy. my probability is only 1/3500. great. no need for invasive test. haha.

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