Weights of Male Infants and Preschoolers in Japan
Japanese government conducts a survey of the physical development of infants every 10 years to clear description of the physical development value and growth curve. The latest survey was conducted in 2010. The following data show the latest data of infants and preschoolers weights by age. The percentile 50 means the median value. You can see the pound version in table 2.
Table 1: Weights for boys, age 0 to 6 (unit: kg)
| percentile | 3 | 10 | 25 | 50 | 75 | 90 | 97 |
| at birth | 2.10 | 2.45 | 2.72 | 3.00 | 3.27 | 3.50 | 3.76 |
| 1 day | 2.06 | 2.39 | 2.62 | 2.89 | 3.14 | 3.38 | 3.63 |
| 2 days | 2.01 | 2.33 | 2.57 | 2.84 | 3.09 | 3.33 | 3.56 |
| 3 days | 2.00 | 2.33 | 2.58 | 2.84 | 3.10 | 3.35 | 3.59 |
| 4 days | 2.03 | 2.36 | 2.60 | 2.88 | 3.14 | 3.38 | 3.62 |
| 5 days | 2.04 | 2.35 | 2.62 | 2.90 | 3.17 | 3.42 | 3.65 |
| 30 days | 3.00 | 3.37 | 3.74 | 4.13 | 4.51 | 4.85 | 5.17 |
| 0 year, 1 to 2 months | 3.53 | 3.94 | 4.35 | 4.79 | 5.22 | 5.59 | 5.96 |
| 2 to 3 months | 4.41 | 4.88 | 5.34 | 5.84 | 6.33 | 6.76 | 7.18 |
| 3 to 4 months | 5.12 | 5.61 | 6.10 | 6.63 | 7.16 | 7.62 | 8.07 |
| 4 to 5 months | 5.67 | 6.17 | 6.67 | 7.22 | 7.76 | 8.25 | 8.72 |
| 5 to 6 months | 6.10 | 6.60 | 7.10 | 7.66 | 8.21 | 8.71 | 9.20 |
| 6 to 7 months | 6.44 | 6.94 | 7.44 | 8.00 | 8.56 | 9.07 | 9.57 |
| 7 to 8 months | 6.73 | 7.21 | 7.71 | 8.27 | 8.84 | 9.36 | 9.87 |
| 8 to 9 months | 6.96 | 7.44 | 7.94 | 8.50 | 9.08 | 9.61 | 10.14 |
| 9 to 10 months | 7.16 | 7.64 | 8.13 | 8.70 | 9.29 | 9.83 | 10.37 |
| 10 to 11 months | 7.34 | 7.81 | 8.31 | 8.88 | 9.48 | 10.03 | 10.59 |
| 11 to 12 months | 7.51 | 7.98 | 8.48 | 9.06 | 9.67 | 10.23 | 10.82 |
| 1 year, 0 to 1 months | 7.68 | 8.15 | 8.65 | 9.24 | 9.86 | 10.44 | 11.04 |
| 1 to 2 months | 7.85 | 8.32 | 8.83 | 9.42 | 10.05 | 10.65 | 11.28 |
| 2 to 3 months | 8.02 | 8.49 | 9.00 | 9.60 | 10.25 | 10.86 | 11.51 |
| 3 to 4 months | 8.19 | 8.67 | 9.18 | 9.79 | 10.44 | 11.08 | 11.75 |
| 4 to 5 months | 8.36 | 8.84 | 9.35 | 9.97 | 10.64 | 11.29 | 11.98 |
| 5 to 6 months | 8.53 | 9.01 | 9.53 | 10.16 | 10.84 | 11.51 | 12.23 |
| 6 to 7 months | 8.70 | 9.18 | 9.71 | 10.35 | 11.04 | 11.73 | 12.47 |
| 7 to 8 months | 8.86 | 9.35 | 9.89 | 10.53 | 11.25 | 11.95 | 12.71 |
| 8 to 9 months | 9.03 | 9.52 | 10.06 | 10.72 | 11.45 | 12.17 | 12.96 |
| 9 to 10 months | 9.19 | 9.69 | 10.24 | 10.91 | 11.65 | 12.39 | 13.20 |
| 10 to 11 months | 9.36 | 9.86 | 10.41 | 11.09 | 11.85 | 12.61 | 13.45 |
| 11 to 12 months | 9.52 | 10.03 | 10.59 | 11.28 | 12.06 | 12.83 | 13.69 |
| 2 years, 0 to 6 months | 10.06 | 10.60 | 11.19 | 11.93 | 12.76 | 13.61 | 14.55 |
| 6 to 12 months | 10.94 | 11.51 | 12.17 | 12.99 | 13.93 | 14.9 | 16.01 |
| 3 years, 0 to 6 months | 11.72 | 12.35 | 13.07 | 13.99 | 15.04 | 16.15 | 17.43 |
| 6 to 12 months | 12.42 | 13.10 | 13.89 | 14.90 | 16.08 | 17.34 | 18.82 |
| 4 years, 0 to 6 months | 13.07 | 13.80 | 14.65 | 15.76 | 17.08 | 18.51 | 20.24 |
| 6 to 12 months | 13.71 | 14.50 | 15.42 | 16.62 | 18.09 | 19.71 | 21.72 |
| 5 years, 0 to 6 months | 14.37 | 15.23 | 16.24 | 17.56 | 19.17 | 20.95 | 23.15 |
| 6 to 12 months | 15.03 | 16.02 | 17.17 | 18.63 | 20.36 | 22.19 | 24.33 |
| 6 years, 0 to 6 months | 15.55 | 16.84 | 18.24 | 19.91 | 21.70 | 23.43 | 25.25 |
Table 2: Weights for boys, age 0 to 6 (unit: pound)
| percentile | 3 | 10 | 25 | 50 | 75 | 90 | 97 |
| at birth | 4.6 | 5.4 | 6.0 | 6.6 | 7.2 | 7.7 | 8.3 |
| 1 day | 4.5 | 5.3 | 5.8 | 6.4 | 6.9 | 7.5 | 8.0 |
| 2 days | 4.4 | 5.1 | 5.7 | 6.3 | 6.8 | 7.3 | 7.8 |
| 3 days | 4.4 | 5.1 | 5.7 | 6.3 | 6.8 | 7.4 | 7.9 |
| 4 days | 4.5 | 5.2 | 5.7 | 6.3 | 6.9 | 7.5 | 8.0 |
| 5 days | 4.5 | 5.2 | 5.8 | 6.4 | 7.0 | 7.5 | 8.0 |
| 30 days | 6.6 | 7.4 | 8.2 | 9.1 | 9.9 | 10.7 | 11.4 |
| 0 year, 1 to 2 months | 7.8 | 8.7 | 9.6 | 10.6 | 11.5 | 12.3 | 13.1 |
| 2 to 3 months | 9.7 | 10.8 | 11.8 | 12.9 | 14.0 | 14.9 | 15.8 |
| 3 to 4 months | 11.3 | 12.4 | 13.4 | 14.6 | 15.8 | 16.8 | 17.8 |
| 4 to 5 months | 12.5 | 13.6 | 14.7 | 15.9 | 17.1 | 18.2 | 19.2 |
| 5 to 6 months | 13.4 | 14.6 | 15.7 | 16.9 | 18.1 | 19.2 | 20.3 |
| 6 to 7 months | 14.2 | 15.3 | 16.4 | 17.6 | 18.9 | 20.0 | 21.1 |
| 7 to 8 months | 14.8 | 15.9 | 17.0 | 18.2 | 19.5 | 20.6 | 21.8 |
| 8 to 9 months | 15.3 | 16.4 | 17.5 | 18.7 | 20.0 | 21.2 | 22.4 |
| 9 to 10 months | 15.8 | 16.8 | 17.9 | 19.2 | 20.5 | 21.7 | 22.9 |
| 10 to 11 months | 16.2 | 17.2 | 18.3 | 19.6 | 20.9 | 22.1 | 23.3 |
| 11 to 12 months | 16.6 | 17.6 | 18.7 | 20.0 | 21.3 | 22.6 | 23.9 |
| 1 year, 0 to 1 months | 16.9 | 18.0 | 19.1 | 20.4 | 21.7 | 23.0 | 24.3 |
| 1 to 2 months | 17.3 | 18.3 | 19.5 | 20.8 | 22.2 | 23.5 | 24.9 |
| 2 to 3 months | 17.7 | 18.7 | 19.8 | 21.2 | 22.6 | 23.9 | 25.4 |
| 3 to 4 months | 18.1 | 19.1 | 20.2 | 21.6 | 23.0 | 24.4 | 25.9 |
| 4 to 5 months | 18.4 | 19.5 | 20.6 | 22.0 | 23.5 | 24.9 | 26.4 |
| 5 to 6 months | 18.8 | 19.9 | 21.0 | 22.4 | 23.9 | 25.4 | 27.0 |
| 6 to 7 months | 19.2 | 20.2 | 21.4 | 22.8 | 24.3 | 25.9 | 27.5 |
| 7 to 8 months | 19.5 | 20.6 | 21.8 | 23.2 | 24.8 | 26.3 | 28.0 |
| 8 to 9 months | 19.9 | 21.0 | 22.2 | 23.6 | 25.2 | 26.8 | 28.6 |
| 9 to 10 months | 20.3 | 21.4 | 22.6 | 24.1 | 25.7 | 27.3 | 29.1 |
| 10 to 11 months | 20.6 | 21.7 | 23.0 | 24.4 | 26.1 | 27.8 | 29.7 |
| 11 to 12 months | 21.0 | 22.1 | 23.3 | 24.9 | 26.6 | 28.3 | 30.2 |
| 2 years, 0 to 6 months | 22.2 | 23.4 | 24.7 | 26.3 | 28.1 | 30.0 | 32.1 |
| 6 to 12 months | 24.1 | 25.4 | 26.8 | 28.6 | 30.7 | 32.8 | 35.3 |
| 3 years, 0 to 6 months | 25.8 | 27.2 | 28.8 | 30.8 | 33.2 | 35.6 | 38.4 |
| 6 to 12 months | 27.4 | 28.9 | 30.6 | 32.8 | 35.5 | 38.2 | 41.5 |
| 4 years, 0 to 6 months | 28.8 | 30.4 | 32.3 | 34.7 | 37.7 | 40.8 | 44.6 |
| 6 to 12 months | 30.2 | 32.0 | 34.0 | 36.6 | 39.9 | 43.5 | 47.9 |
| 5 years, 0 to 6 months | 31.7 | 33.6 | 35.8 | 38.7 | 42.3 | 46.2 | 51.0 |
| 6 to 12 months | 33.1 | 35.3 | 37.9 | 41.1 | 44.9 | 48.9 | 53.6 |
| 6 years, 0 to 6 months | 34.3 | 37.1 | 40.2 | 43.9 | 47.8 | 51.7 | 55.7 |
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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