It's my understanding that Elves have just a few children because the parents must give up part of their Fea (spirit) for the new child.
I have also heard that They tend to have them in the 1st few years of marriage, but Elrond's sons are about 100 years older than Arwen, so this is not set in granite.
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Blessed be the Lord my Strength, Who trained my hands for war and my fingers to fight. Psallm 144:1
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