Your son is very tall for his age but his weight is just about on the average for a boy of 8 years.I would take notice of his pains in his feet ,knees and hips.There are certain conditions usually affecting carTilage in the bones of growing children that need to be excluded. It would be best to ask yor paediatrician to see your son just to be sure that all is well. It is important that he has an Xray done of his knees and hips.
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