以下是引用月照一孤舟在4/5/2012 12:42:00 AM的发言：
只能怨她没她老公聪明。。。不是说有研究表明，如果女方比男方聪明，就容易生男孩；反之则容易生女孩

And it is also said that smart moms have smart kids, vice versa. If both were true together they would suggest girls are more likely to be less smart than boys.