Hi Amit, 

There are a multitude of ways to measure obesity, from simple methodological approaches that provide an estimate of fatness through to comprehensive measures that can actually quantify fat mass. The most appropriate measure will be fully dependent on your target population. As your original question concerns bullying, is your population of interest pediatrics? If so the following papers will help you decide the best tools and ways forward for you. 

http://onlinelibrary.wiley.com/doi/10.1111/j.1467-789X.2004.00133.x/full

http://www.bmj.com/bmj/section-pdf/186033?path=/bmj/337/7675/Clinical_Review.full.pdf

I hope this begins to offer some help. 

good article sir. There is an urgent need to make people aware of what child weight is. ignorance among the public is so huge that the food industry is taking advantage of. truly the role of pediasure and obesity is to be undertaken

Hello Amit Vishwakarma

please check the resources

http://worldwidescience.org/topicpages/o/obesity+measures+based.html

www.bmj.com/rapid-responses?sort_by=field_highwire_a...value_1..

http://europepmc.org/abstract/med/8387967

http://europepmc.org/abstract/med/8696427

www.hsph.harvard.edu › Obesity Prevention Source › Obesity Definition

www.noo.org.uk/NOO_about_obesity/measuremen

https://www.mailman.columbia.edu/public-health-now/news/what-best-way-measure-obesity

www.todaysdietitian.com/newarchives/010614p30.shtml

healthland.time.com/2013/08/.../why-bmi-isnt-the-best-measure-for-weight-or-health/

thanks Benjamin Paul Green Satyaprasad Venkata Harshvardhan Singh Nirmala S.V.S.G