There is no particular weight for a 12-year-old boy because weight is related to height and body composition. For in-depth information about weight in relation to height, and to see the distribution of weights and heights of children at various ages, please see the page link, further down this page, listed under Related Questions.
My personal opinion a 12 year old boy is supposed to weigh 100-135
the weight for a 135cm boy is 33kg
what is the average weight of a 9 year old boy
what is the average weight for a 7 year old boy
The weight depends on the age.
The average weight would be around 130.
The average weight of a 2-year-old boy is about 33 to 45 lb.
15 kilograms is the average weight for 3 year old boy
The average weight and height of an 11yr old boy is about 80-87lbs.
95
The average weight would be around 130.
the average weight of 15 year old boy is 50 kgs
== == An average weight for a 5' 9 boy is between 140-165lbs.