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That's a really tall 11 year old! If it's a boy, then around 100 to 110 lbs. 100 lbs is thin for somebody who's 5'7'', but 11 year old children haven't gained muscle mass yet, which adds a lot of weight. Since girl children are typically less muscular than boys, a 5'7'' 11 year old should weight between 90 and 100 pounds.

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15y ago

What else can I help you with?