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Generally the normal weight of a 13 year old boy should be around 40-45 kg. But it should never be crossed over 50kgs. But obese boys may have some high weight, but i am talking about for only normal cases. This age is the starting of puberty, so keep conscious such that weight might never fall. It's the age of growing- mentally and physically.some exercise needed to have stout body mass index.

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14y ago

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