Weight for boys at 3 years
At 3 years, the median weight for boys on the CDC 2000 growth charts is 14.3 kg (31 lb 9 oz): half of boys this age weigh less and half more. The middle half of boys, from the 25th to the 75th percentile, falls between 13.3 and 15.5 kg, a spread of 2.17 kg. The outer lines of the chart, the 3rd and 97th percentiles, sit at 11.8 and 17.9 kg.
Since 2 years, the median has risen by 1.66 kg over 1 year. By 4 years it reaches 16.2 kg.
For girls at 3 years the median is 13.9 kg, 0.46 kg less than for boys, which is why the charts are drawn separately by sex.
From 2 years CDC recommends its own 2000 growth charts, which draw the 3rd to the 97th percentile; under 2, the WHO charts draw the 2nd to the 98th.
Reading the table: a boy at 3 years who weighs 15.0 kg is at about the 66th percentile, meaning that out of 100 boys this age, about 66 weigh less.
Percentiles at 3 years
Download CSV (all ages)| Percentile | z-score | Metric | Imperial |
|---|---|---|---|
| 3rd | −1.88 | 11.76 kg | 25 lb 15 oz |
| 5th | −1.64 | 12.04 kg | 26 lb 9 oz |
| 10th | −1.28 | 12.49 kg | 27 lb 9 oz |
| 25th | −0.67 | 13.31 kg | 29 lb 6 oz |
| 50th (median) | 0.00 | 14.33 kg | 31 lb 9 oz |
| 75th | +0.67 | 15.48 kg | 34 lb 2 oz |
| 90th | +1.28 | 16.64 kg | 36 lb 11 oz |
| 95th | +1.64 | 17.41 kg | 38 lb 6 oz |
| 97th | +1.88 | 17.94 kg | 39 lb 9 oz |
CDC 2000 charts draw the 3rd to the 97th percentile. Values computed with the LMS method from the published tables (retrieved 2026-10-05).