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Thank you very much for your answer and information.
To J_9: yes he just stiffens for a while then back to normal. But this time was lasting for hours.

But the "stiffen" happens more frequently...

My brother's baby boy 4 months old got a strange illness. He had blood tested, brain scanning, lung checking etc. Everything is normal. But the baby boy got an unpreditable "body harden" illness....