Weight Measurement in Children

1. See Also
   1. Height Measurement in Children
   2. Growth Assessment
2. Physiology
   1. Weight is best assessment of nutrition and growth
3. Normal Weight Increases
   1. Birth Weight
      1. Weight doubles by 4-5 months of age
      2. Weight triples by 1 year of age
      3. Weight quadruples by 2 years of age
   2. Annual increase (Ages 2-9): 5 lb/year (2.25 kg/year)
4. Normal Weight in boys (range: 3% to 97%)
   1. Age 1 year: 21-32 lbs, mean: 10 kg (22 lb)
   2. Age 2 years: 23-35 lbs, mean: 13 kg (28 lb)
   3. Age 3 years: 27-39 lbs, mean: 15 kg (33 lb)
   4. Age 4 years: 30-43 lbs, mean: 17 kg (37 lb)
   5. Age 5 years: 34-52 lbs, mean: 19 kg (42 lb)
   6. Age 6 years: 39-61 lbs, mean: 21 kg (46 lb)
   7. Age 7 years: 43-70 lbs, mean: 23 kg (51 lb)
   8. Age 8 years: 48-79 lbs, mean: 25 kg (55 lb)
   9. Age 9 years: 53-90 lbs, mean: 28 kg (62 lb)
   10. Age 10 years: 57-100 lbs, mean: 31 kg (68 lb)
   11. Age 11 years: 62-112 lbs, mean: 35 kg (77 lb)
   12. Age 12 years: 67-124 lbs, mean: 40 kg (88 lb)
   13. Age 13 years: 72-138 lbs, mean: 45 kg (99 lb)
   14. Age 14 years: 80-151 lbs, mean: 51 kg (112 lb)
   15. Age 15 years: 91-162 lbs, mean: 57 kg (125 lb)
   16. Age 16 years: 103-171 lbs, mean: 62 kg (136 lb)
   17. Age 17 years: 111-176 lbs, mean: 136 lbs
   18. Age 18 years: 69 kg (152 lb)
5. Normal Weight in Girls (range: 3% to 97%)
   1. Birth: 5.8-9.4 lbs, mean: 3 kg (7 lb)
   2. Age 1 year: 17-27 lbs, mean: 10 kg (22 lb)
   3. Age 2 years: 22-34 lbs, mean: 12 kg (27 lb)
   4. Age 3 years: 26-42 lbs, mean: 15 kg (32 lb)
   5. Age 4 years: 29-48 lbs, mean: 16 kg (36 lb)
   6. Age 5 years: 33-52 lbs, mean: 19 kg (41 lb)
   7. Age 6 years: 37-59 lbs, mean: 21 kg (47 lb)
   8. Age 7 years: 41-67 lbs, mean: 24 kg (52 lb)
   9. Age 8 years: 45-79 lbs, mean: 26 kg (58 lb)
   10. Age 9 years: 49-90 lbs, mean: 29 kg (64 lb)
   11. Age 10 years: 53-102 lbs, mean: 32 kg (70 lb)
   12. Age 11 years: 58-113 lbs, mean: 36 kg (79 lb)
   13. Age 12 years: 64-128 lbs, mean: 40 kg (88 lb)
   14. Age 13 years: 72-142 lbs, mean: 45 kg (99 lb)
   15. Age 14 years: 83-151 lbs, mean: 49 kg (108 lb)
   16. Age 15 years: 89-155 lbs, mean: 52 kg (114 lb)
   17. Age 16 years: 92-158 lbs, mean: 53 kg (117 lb)
   18. Age 17 years: 94-160 lbs, mean: 54 kg (119 lb)
6. Resources
   1. WHO updated growth charts (predominantly Breast fed infants, data from 6 countries)
      1. http://www.who.int/childgrowth
   2. New CDC Growth Charts reflecting Body Mass Index (typically heavier than WHO cohorts)
      1. http://www.cdc.gov/growthcharts