The World Health Organization (WHO) defines overweight and obesity as ''abnormal or excessive fat accumulation that presents a risk to health''.
Because children undergo a number of physiological changes as they grow, several factors must be used to determine a body's healthy weight. Calculating Body Mass Index (BMI) is a common screening tool for assessing a child's growth pattern. BMI is calculated using age, height and weight measurements to obtain a percentile ranking among children of the same age and sex.
For more information regarding BMI, or general growth standards, consider the following resources: