Being on Ritalin, it is common for children to be a 'bit skinny' due to their reduced appetite most experience. Weight is also dependent on bone structure, amount of muscle and metabolism. More important than how he looks is his energy levels and general feeling of wellbeing; if these are high there is generally little to worry about. Having said all this, a (very) rough guideline for his age and height is between 45 to 65kg.
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