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My 3½ year old grandson - diagnosed as mildly autistic - is obsessed with fans of any kind (floor, ceiling and a/c condenser) and most objects that can spin. He will dance on toes and hand-flap when watching the fan action. He will go to any extreme to get to a fan. My questions: Is allowing him access to this stimulus just adding to his autism? How do I discourage his actions if they are bad for him (we live in the South and air conditioning is everywhere as are fans)?
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Thank you very much for any advise you may give me.

my little brother is autistic and he is OBSESSED with clocks, watches and radios. I dont think it is a bad thing to give them the things they are obsessed with. its just something that keeps them content. as long as he knows NOT to stick his fingers or other objects in the fan i personally see nothing wrong with it ;)