I think originally they were just a superior race to the Elves in Tolkien's mind, but later on, as the legendarium evolved, they became a higher, purer race, and higher, purer races don't usually have kids. That was when their "children" were turned into their Maiar.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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