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Depends on his height.
http://www.nhlbisupport.com/bmi/
My brother he is skinny and he weighs 4 stone and hes 4'12 i think its 5 stone 2 5 and a bit

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8y ago
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12y ago

120 ponds not more. you already know the motto y.o.l.o- you only live once

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Q: How much should a 9 year old boy weigh?
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