It is 128 - 138 any doctor will tell you that
My son is 5 1 and weight 85 he needs to gain weight I think but the doctor said it is normal
The average weight of an 11 year old with 5 1" is around 128 pounds to 134 pounds. See the height and weight chart for your reference:
My mum is 122 lbs so when people say an 11 yr old should be like 138 their out of their mind! Thats how much a female grown up should weigh so probably an 11 yr old boy at 5'1 should be somewhere around 82 just to let you know 10 should be around 77.
My son is 107ibs
My son is 5'2" tall and 135 lbs, is that within normal limits.