This all depends on his height. I would go to www.webmd.com and search 'tools'. This will lead you to a page where you can pick a tool (in this case, the healthy weight tool) and enter his height and activity level. This should do the trick
105 or so
you should weight something that includes numbers..
About 100 pounds.
150 pounds
100 pounds
check his BMI
The average weight for a 5-6 foot male is between 120-125 pounds.
About 95-100 lb.
Buy him Band Hero.
The average 5'10 boy weighs anywhere from 150lbs - 180lbs.
100-120
The average UK height and weight for a 12 year old girl is 4 ft 9 in and 91.5 lbs. The average height and weight for a boy of the same age is 4 ft 8 in and 88 lbs.