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I have heard that the six sons of Devaki were killed one by one by Kamsa but never heard before that they were also brought back by lord Krishna.

I listen, as soon as Kamsa knows their birth, he comes there and kills the newly born. Is it right or after how many days he used to kill?

Were they killed before they were assigned their names?

So, when and how did lord Krishna brought back them?

What is the purpose and story for those six brothers to killed by Kamsa and brought back by lord Krishna? Were they still babies when brought back?