In the actual epic, he does not know. He just thinks in his excessive pride, that this child will feel my wrath. Krishna's identity up until Govardhan Giri story was a need to know basis. After this story people start to realize and remember his divinity from birth and Kans becomes very paranoid. After Dhenuka and Perambalsur he also realizes about Balram and soon will summon both to his court to kill.
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