A good question. I could perhaps understand that it would be so if the two male (or female as the case may be) parents shared exactly the same characteristics, and if neither brought anything different to the table...but surely this is unlikely in the extreme. This would also appear to imply that children of single parents are inherently worse off, and that is not necessarily the case either.
The crucial formative years for a child don't have anything to do with gender. There's an age where children have to "cement" the sounds of their native language in order to be able to hear them well at a later age, for example, and that's the kind of thing people mean when they say crucial formative years.
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