Ministry of Health, Labour and Welfare gathers data of children's measurements every 10 years. The latest survey was conducted in 2010. The data below presents weights of 0-6 years old girls in Japan. 50 percentile means the median value. You can see the pound version in table 2.
Table 1: Weights for girls, age 0 to 6 (unit: kg)
| percentile | 3 | 10 | 25 | 50 | 75 | 90 | 97 |
| at birth | 2.13 | 2.41 | 2.66 | 2.94 | 3.18 | 3.41 | 3.67 |
| 1 day | 2.07 | 2.34 | 2.56 | 2.81 | 3.06 | 3.28 | 3.53 |
| 2 days | 2.04 | 2.29 | 2.51 | 2.76 | 2.99 | 3.22 | 3.46 |
| 3 days | 2.03 | 2.28 | 2.51 | 2.76 | 3.00 | 3.23 | 3.47 |
| 4 days | 2.05 | 2.31 | 2.54 | 2.79 | 3.04 | 3.26 | 3.50 |
| 5 days | 2.03 | 2.31 | 2.54 | 2.81 | 3.06 | 3.28 | 3.54 |
| 30 days | 2.90 | 3.22 | 3.54 | 3.89 | 4.23 | 4.54 | 4.84 |
| 0 year, 1 to 2 months | 3.39 | 3.73 | 4.08 | 4.47 | 4.86 | 5.20 | 5.54 |
| 2 to 3 months | 4.19 | 4.58 | 4.97 | 5.42 | 5.86 | 6.27 | 6.67 |
| 3 to 4 months | 4.84 | 5.25 | 5.67 | 6.15 | 6.64 | 7.08 | 7.53 |
| 4 to 5 months | 5.35 | 5.77 | 6.21 | 6.71 | 7.23 | 7.70 | 8.18 |
| 5 to 6 months | 5.74 | 6.17 | 6.62 | 7.14 | 7.67 | 8.17 | 8.67 |
| 6 to 7 months | 6.06 | 6.49 | 6.95 | 7.47 | 8.02 | 8.53 | 9.05 |
| 7 to 8 months | 6.32 | 6.75 | 7.21 | 7.75 | 8.31 | 8.83 | 9.37 |
| 8 to 9 months | 6.53 | 6.97 | 7.43 | 7.97 | 8.54 | 9.08 | 9.63 |
| 9 to 10 months | 6.71 | 7.15 | 7.62 | 8.17 | 8.74 | 9.29 | 9.85 |
| 10 to 11 months | 6.86 | 7.31 | 7.78 | 8.34 | 8.93 | 9.49 | 10.06 |
| 11 to 12 months | 7.02 | 7.46 | 7.95 | 8.51 | 9.11 | 9.68 | 10.27 |
| 1 year, 0 to 1 months | 7.16 | 7.62 | 8.11 | 8.68 | 9.29 | 9.87 | 10.48 |
| 1 to 2 months | 7.31 | 7.77 | 8.27 | 8.85 | 9.47 | 10.07 | 10.69 |
| 2 to 3 months | 7.46 | 7.93 | 8.43 | 9.03 | 9.66 | 10.27 | 10.90 |
| 3 to 4 months | 7.61 | 8.08 | 8.60 | 9.20 | 9.85 | 10.47 | 11.12 |
| 4 to 5 months | 7.75 | 8.24 | 8.76 | 9.38 | 10.04 | 10.67 | 11.33 |
| 5 to 6 months | 7.90 | 8.39 | 8.93 | 9.55 | 10.23 | 10.87 | 11.55 |
| 6 to 7 months | 8.05 | 8.55 | 9.09 | 9.73 | 10.42 | 11.08 | 11.77 |
| 7 to 8 months | 8.20 | 8.71 | 9.26 | 9.91 | 10.61 | 11.28 | 11.99 |
| 8 to 9 months | 8.34 | 8.86 | 9.43 | 10.09 | 10.81 | 11.49 | 12.21 |
| 9 to 10 months | 8.49 | 9.02 | 9.59 | 10.27 | 11.00 | 11.70 | 12.44 |
| 10 to 11 months | 8.64 | 9.18 | 9.76 | 10.46 | 11.20 | 11.92 | 12.67 |
| 11 to 12 months | 8.78 | 9.34 | 9.93 | 10.64 | 11.40 | 12.13 | 12.90 |
| 2 years, 0 to 6 months | 9.30 | 9.89 | 10.53 | 11.29 | 12.11 | 12.90 | 13.73 |
| 6 to 12 months | 10.18 | 10.85 | 11.56 | 12.43 | 13.36 | 14.27 | 15.23 |
| 3 years, 0 to 6 months | 11.04 | 11.76 | 12.56 | 13.53 | 14.59 | 15.64 | 16.76 |
| 6 to 12 months | 11.83 | 12.61 | 13.49 | 14.56 | 15.75 | 16.95 | 18.27 |
| 4 years, 0 to 6 months | 12.56 | 13.39 | 14.33 | 15.51 | 16.84 | 18.21 | 19.73 |
| 6 to 12 months | 13.27 | 14.15 | 15.15 | 16.41 | 17.89 | 19.43 | 21.20 |
| 5 years, 0 to 6 months | 14.01 | 14.92 | 15.97 | 17.32 | 18.93 | 20.65 | 22.69 |
| 6 to 12 months | 14.81 | 15.75 | 16.84 | 18.27 | 20.00 | 21.91 | 24.22 |
| 6 years, 0 to 6 months | 15.71 | 16.68 | 17.81 | 19.31 | 21.15 | 23.21 | 25.77 |
Table 2: Weights for girls, age 0 to 6 (unit: pound)
| percentile | 3 | 10 | 25 | 50 | 75 | 90 | 97 |
| at birth | 4.7 | 5.3 | 5.9 | 6.5 | 7.0 | 7.5 | 8.1 |
| 1 day | 4.6 | 5.2 | 5.6 | 6.2 | 6.7 | 7.2 | 7.8 |
| 2 days | 4.5 | 5.0 | 5.5 | 6.1 | 6.6 | 7.1 | 7.6 |
| 3 days | 4.5 | 5.0 | 5.5 | 6.1 | 6.6 | 7.1 | 7.7 |
| 4 days | 4.5 | 5.1 | 5.6 | 6.2 | 6.7 | 7.2 | 7.7 |
| 5 days | 4.5 | 5.1 | 5.6 | 6.2 | 6.7 | 7.2 | 7.8 |
| 30 days | 6.4 | 7.1 | 7.8 | 8.6 | 9.3 | 10.0 | 10.7 |
| 0 year, 1 to 2 months | 7.5 | 8.2 | 9.0 | 9.9 | 10.7 | 11.5 | 12.2 |
| 2 to 3 months | 9.2 | 10.1 | 11.0 | 11.9 | 12.9 | 13.8 | 14.7 |
| 3 to 4 months | 10.7 | 11.6 | 12.5 | 13.6 | 14.6 | 15.6 | 16.6 |
| 4 to 5 months | 11.8 | 12.7 | 13.7 | 14.8 | 15.9 | 17.0 | 18.0 |
| 5 to 6 months | 12.7 | 13.6 | 14.6 | 15.7 | 16.9 | 18.0 | 19.1 |
| 6 to 7 months | 13.4 | 14.3 | 15.3 | 16.5 | 17.7 | 18.8 | 20.0 |
| 7 to 8 months | 13.9 | 14.9 | 15.9 | 17.1 | 18.3 | 19.5 | 20.7 |
| 8 to 9 months | 14.4 | 15.4 | 16.4 | 17.6 | 18.8 | 20.0 | 21.2 |
| 9 to 10 months | 14.8 | 15.8 | 16.8 | 18.0 | 19.3 | 20.5 | 21.7 |
| 10 to 11 months | 15.1 | 16.1 | 17.2 | 18.4 | 19.7 | 20.9 | 22.2 |
| 11 to 12 months | 15.5 | 16.4 | 17.5 | 18.8 | 20.1 | 21.3 | 22.6 |
| 1 year, 0 to 1 months | 15.8 | 16.8 | 17.9 | 19.1 | 20.5 | 21.8 | 23.1 |
| 1 to 2 months | 16.1 | 17.1 | 18.2 | 19.5 | 20.9 | 22.2 | 23.6 |
| 2 to 3 months | 16.4 | 17.5 | 18.6 | 19.9 | 21.3 | 22.6 | 24.0 |
| 3 to 4 months | 16.8 | 17.8 | 19.0 | 20.3 | 21.7 | 23.1 | 24.5 |
| 4 to 5 months | 17.1 | 18.2 | 19.3 | 20.7 | 22.1 | 23.5 | 25.0 |
| 5 to 6 months | 17.4 | 18.5 | 19.7 | 21.1 | 22.6 | 24.0 | 25.5 |
| 6 to 7 months | 17.7 | 18.8 | 20.0 | 21.5 | 23.0 | 24.4 | 25.9 |
| 7 to 8 months | 18.1 | 19.2 | 20.4 | 21.8 | 23.4 | 24.9 | 26.4 |
| 8 to 9 months | 18.4 | 19.5 | 20.8 | 22.2 | 23.8 | 25.3 | 26.9 |
| 9 to 10 months | 18.7 | 19.9 | 21.1 | 22.6 | 24.3 | 25.8 | 27.4 |
| 10 to 11 months | 19.0 | 20.2 | 21.5 | 23.1 | 24.7 | 26.3 | 27.9 |
| 11 to 12 months | 19.4 | 20.6 | 21.9 | 23.5 | 25.1 | 26.7 | 28.4 |
| 2 years, 0 to 6 months | 20.5 | 21.8 | 23.2 | 24.9 | 26.7 | 28.4 | 30.3 |
| 6 to 12 months | 22.4 | 23.9 | 25.5 | 27.4 | 29.5 | 31.5 | 33.6 |
| 3 years, 0 to 6 months | 24.3 | 25.9 | 27.7 | 29.8 | 32.2 | 34.5 | 36.9 |
| 6 to 12 months | 26.1 | 27.8 | 29.7 | 32.1 | 34.7 | 37.4 | 40.3 |
| 4 years, 0 to 6 months | 27.7 | 29.5 | 31.6 | 34.2 | 37.1 | 40.1 | 43.5 |
| 6 to 12 months | 29.3 | 31.2 | 33.4 | 36.2 | 39.4 | 42.8 | 46.7 |
| 5 years, 0 to 6 months | 30.9 | 32.9 | 35.2 | 38.2 | 41.7 | 45.5 | 50.0 |
| 6 to 12 months | 32.7 | 34.7 | 37.1 | 40.3 | 44.1 | 48.3 | 53.4 |
| 6 years, 0 to 6 months | 34.6 | 36.8 | 39.3 | 42.6 | 46.6 | 51.2 | 56.8 |
Source is Ministry of Health, Labour and Welfare 乳幼児身体発育調査
www.mhlw.go.jp/toukei/list/73-22b.html
www.mhlw.go.jp/toukei/list/dl/73-22-01.pdf
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