"The reliability of body mass index in the diagnosis of obesity and metabolic risk in children" https://www.ncbi.nlm.nih.gov/pubmed/25503667
"Body mass index 'may not reflect child obesity'" http://www.nhs.uk/news/2012/06june/Pages/body-mass-index-child-obesity.aspx
"A simple guide to classifying body mass index in children" http://www.noo.org.uk/uploads/doc/vid_11601_A_simple_guide_to_classifying_BMI_in_children.pdf
BMI for children have special calculation and I agre it is not only showing the obesity, there are other measurements. In my research I have used pediatric scale for compare age, high and weaith .