Rae, no one can definitively answer, of course, but in my opinion, twins could just happen without being a conscious choice. Since we know only of identical twins (Elladan and Elrohir), I assume that they were the product of a single fertilized cell at the beginning. The split that produces twins is no choice of the mother, though she would probably realize sometime during pregnancy that she was carrying twins. So the birth would be no surprise, I assume.
(I would also assume that no mother in her right mind would consciously choose to have twins!! One baby at a time is enough! [img]smilies/wink.gif[/img] )
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'Mercy!' cried Gandalf. 'If the giving of information is to be the cure of your inquisitiveness, I shall spend all the rest of my days in answering you. What more do you want to know?' 'The whole history of Middle-earth.. .'
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