13 stones is 82.5 kg and add 4.1 kg for 9 pounds so its 86.6 kg.
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13st 6 is 85.3 kilograms.
A brick weighs about 3.5 to 9lbs.
I am not sure, but I know he was heavy for a baby. I would guess around 9lbs 11 ounces.
84.2 kg = 13st 3.6lb
87Kg = 191.4lb or 13st 9.4lb