After the kyuubi attack, kaguya used all of her remaining strength that she gathered over a 100 years ever since she got sealed she created her third son a son that she made in her exact image and a fragment of the juubi powers making the 3rd son a jinchuriki of the juubi then she used the remaining strength she teleported her baby next to naruto Uzumaki then kaguya fell asleep for a million years
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