Why is my iPhone 5c heating up so fast?

I just gt an iPhone 5c (blue) for christmas and it heats up really fast, like when I charge the phone it gets really hot but I don't know why anyone know? Any answers appreciated

The battery may be defective.

The battery is defective or a bad circuit board. Stop the charging right away or it could blow-up. Bring it back for a replacement while it still new.

Well it shouldn't stay cold.

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