There is no specific age, when you feel that your son can pronounce all the letter correctly you can start with him, Setting a good model, being patient, making dua, and good environment are things that may help. May Allah make him among His righteous slaves.

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No, it is not permissible and it doesn’t count. They do this in prayer, their prayer is invalid.

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No, your fast is not valid , you have to make up for this day.

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