His weight is exactly on the average for his age and he is rather tall[his height is in the top 25% for children of his age. So he is tall and appears thin as his weight is average, but not at the same level to match his height. If he is eating well and is doing well then I would not be at all concerned about him. If his appetite is poor, it may be due to the Concerta which can diminish a child's appetite.
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