kefir side effect for autism child?

hello, i'm new at making kefir,
after a long search about kefir, i found it good for autism child,
and i give it to my friend's child that have autism,
after drink 1 cup of kefir, he got high temp..
i wonder if i make it wrong or it's side effect?
any one can help my problem?

and 1 more,
is it okay to place kefir at fridge together with my homemade yoghurt?

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