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During puberty, significant weight and height changes often occur quickly and may even appear to be erratic. Thus, gauging what constitutes a healthy weight and body mass index (BMI) can be difficult, and gauging whether or not concern is warranted over sudden weight changes in a girl or boy is difficult. Also, girls and boys may feel awkward about rapid changes in their physical appearance. At a recent Educators Seminar sponsored by the National Eating Disorders Association, Craig Johnson, PhD, Director of the Eating Disorders Program at Laureate Psychiatric Hospital in Tulsa, Oklahoma, and Clinical Professor of Psychiatry at the University of Oklahoma College of Medicine, noted that the average expected weight gain for girls is 40 pounds (lb.) from age 11 to age 14. Presented below is information from the U.S. Centers for Disease Control and Prevention (CDC) about BMI and weight/height development charts for boys and girls ages 2 to 20.
The growth charts consist of a series of percentile curves that illustrate the distribution of selected body measurements in U.S. children. Pediatric growth charts have been used by pediatricians, nurses, and parents to track the growth of infants, children, and adolescents in the United States since 1977. The 1977 growth charts were developed by the National Center for Health Statistics (NCHS) as a clinical tool for health professionals to determine if the growth of a child is adequate. The 1977 charts were also adopted by the World Health Organization for international use.
When the 1977 NCHS growth charts were first developed, NCHS recommended that they be revised periodically as necessary. With more recent and comprehensive national data now available, along with improved statistical procedures, the 1977 growth charts were revised and updated to make them a more valuable clinical tool for health professionals. The 2000 CDC growth charts represent the revised version of the 1977 NCHS growth charts. Most of the data used to construct these charts come from the National Health and Nutrition Examination Survey (NHANES), which has periodically collected height and weight and other health information on the American population since the early 1960's.
Growth charts are not intended to be used as a sole diagnostic instrument. Instead, growth charts are tools that contribute to forming an overall clinical impression for the child being measured. The revised growth charts provide an improved tool for evaluating the growth of children in clinical and research settings.
The 2000 CDC Growth Charts and the New Body Mass Index-For-Age Charts
Most of the specific differences between the revised charts and the original charts occur in the charts for infants, where national data were previously lacking. The revised head circumference charts also show some noticeable differences when compared to the earlier charts. Compared to the original infant charts that were based on primarily formula-fed infants, the revised growth charts for infants contain a better mix of both breast- and formula-fed infants in the U. S. population. (On average, since 1970 approximately one-half of children born in the United States are reported to have been breast fed at some point, and about one-third have been breast fed for 3 months or more.) The addition of the BMI charts is probably the single most significant new feature of the revised growth charts.
These BMI-for-age charts were created for use in place of the 1977 weight-for-stature charts. BMI (wt/ht2) is calculated from weight and height measurements and is used to judge whether an individual's weight is appropriate for their height. BMI is the most commonly used approach to determine if adults are overweight or obese and is also the recommended measure to determine if children are overweight. The new BMI growth charts can be used clinically beginning at 2 years of age, when an accurate stature can be obtained.
In recent years, BMI has received increased attention for pediatric use. In 1994, an expert committee charged with developing guidelines for overweight in adolescent preventive services (ages 11-21 years) recommended that BMI be used routinely to screen for overweight adolescents. In addition, in 1997 an expert committee on the assessment and treatment of childhood obesity concluded that BMI should be used to screen for overweight children, ages 2 years and older, using the BMI curves from the revised growth charts. BMI can also be used to characterize underweight (though no expert guidelines exist for the classification of underweight based on BMI).
Link to BMI calculator: http://www.cdc.gov/nccdphp/dnpa/bmi/childrens_BMI/about_childrens_BMI.htm Need to enter birthdate, height, and weight to calculate BMI.
Boys 2 to 20 years weight-for-age chart http://www.cdc.gov/nchs/data/nhanes/growthcharts/set2/chart%2003.pdf
Boys 2 to 20 years weight-for-stature chart http://www.cdc.gov/nchs/data/nhanes/growthcharts/set2/chart%2013.pdf
Girls 2 to 20 years weight-for-age chart http://www.cdc.gov/nchs/data/nhanes/growthcharts/set2/chart%2004.pdf
Girls 2 to 20 years weight-for-stature chart http://www.cdc.gov/nchs/data/nhanes/growthcharts/set2/chart%2014.pdf