A health care related company Rooty released the data of the kids average height and weight.
The table below shows the avarege height and weight of 0-17 year-old boys in Japan. 2015 version.
| Age | Average height | Average weight | ||||
| 0 year-old | cm | feet | Standard deviation | kg | pounds | Standard deviation |
| 0 months | 49.0 | 1' 7" | 2.1 | 3.0 | 6.6 | 0.4 |
| 1 months | 53.5 | 1' 9" | 2.2 | 4.3 | 9.5 | 0.6 |
| 2 months | 57.9 | 1' 11" | 2.2 | 5.5 | 12.1 | 0.7 |
| 3 months | 61.4 | 2' 0" | 2.2 | 6.4 | 14.1 | 0.8 |
| 4 months | 64.2 | 2' 1" | 2.3 | 7.1 | 15.7 | 0.9 |
| 5 months | 66.2 | 2' 2" | 2.3 | 7.7 | 17.0 | 0.8 |
| 6 months | 67.8 | 2' 3" | 2.4 | 8.0 | 17.6 | 0.9 |
| 7 months | 69.2 | 2' 3" | 2.4 | 8.2 | 18.1 | 0.9 |
| 8 months | 70.5 | 2' 4" | 2.4 | 8.6 | 19.0 | 1 |
| 9 months | 71.7 | 2' 4" | 2.5 | 8.9 | 19.6 | 1 |
| 10 months | 72.8 | 2' 5" | 2.5 | 9.1 | 20.1 | 0.9 |
| 11 months | 73.9 | 2' 5" | 2.5 | 9.2 | 20.3 | 0.9 |
| 1 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 75.0 | 2' 6" | 2.6 | 9.3 | 20.5 | 0.9 |
| 1 months | 76.0 | 2' 6" | 2.6 | 9.5 | 20.9 | 0.9 |
| 2 months | 76.9 | 2' 6" | 2.6 | 9.8 | 21.6 | 1 |
| 3 months | 77.8 | 2' 7" | 2.7 | 9.9 | 21.8 | 1 |
| 4 months | 78.7 | 2' 7" | 2.7 | 10.1 | 22.3 | 1 |
| 5 months | 79.6 | 2' 7" | 2.8 | 10.3 | 22.7 | 1.1 |
| 6 months | 80.5 | 2' 8" | 2.8 | 10.5 | 23.1 | 1.2 |
| 7 months | 81.4 | 2' 8" | 2.8 | 10.6 | 23.4 | 1.1 |
| 8 months | 82.3 | 2' 8" | 2.9 | 10.9 | 24.0 | 1.1 |
| 9 months | 83.1 | 2' 9" | 2.9 | 11.2 | 24.7 | 1.2 |
| 10 months | 83.9 | 2' 9" | 2.9 | 11.3 | 24.9 | 1.2 |
| 11 months | 84.7 | 2' 9" | 3 | 11.4 | 25.1 | 1.1 |
| 2 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 85.4 | 2' 10" | 3 | 11.6 | 25.6 | 1.2 |
| 1 months | 86.2 | 2' 10" | 3.1 | 11.8 | 26.0 | 1.2 |
| 2 months | 86.9 | 2' 10" | 3.1 | 12.0 | 26.5 | 1.2 |
| 3 months | 87.6 | 2' 10" | 3.1 | 12.1 | 26.7 | 1.3 |
| 4 months | 88.3 | 2' 11" | 3.2 | 12.3 | 27.1 | 1.3 |
| 5 months | 88.9 | 2' 11" | 3.2 | 12.5 | 27.6 | 1.3 |
| 6 months | 89.6 | 2' 11" | 3.2 | 12.7 | 28.0 | 1.3 |
| 7 months | 90.2 | 2' 12" | 3.3 | 12.8 | 28.2 | 1.3 |
| 8 months | 90.8 | 2' 12" | 3.3 | 13.0 | 28.7 | 1.4 |
| 9 months | 91.5 | 3' 0" | 3.3 | 13.2 | 29.1 | 1.4 |
| 10 months | 92.1 | 3' 0" | 3.4 | 13.3 | 29.3 | 1.4 |
| 11 months | 92.7 | 3' 0" | 3.4 | 13.5 | 29.8 | 1.5 |
| 3 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 93.3 | 3' 1" | 3.5 | 13.7 | 30.2 | 1.5 |
| 1 months | 94.0 | 3' 1" | 3.5 | 13.9 | 30.6 | 1.6 |
| 2 months | 94.6 | 3' 1" | 3.5 | 14.0 | 30.9 | 1.6 |
| 3 months | 95.1 | 3' 1" | 3.6 | 14.2 | 31.3 | 1.7 |
| 4 months | 95.7 | 3' 2" | 3.6 | 14.4 | 31.7 | 1.7 |
| 5 months | 96.3 | 3' 2" | 3.6 | 14.5 | 32.0 | 1.7 |
| 6 months | 96.9 | 3' 2" | 3.7 | 14.7 | 32.4 | 1.8 |
| 7 months | 97.5 | 3' 2" | 3.7 | 14.8 | 32.6 | 1.8 |
| 8 months | 98.0 | 3' 3" | 3.7 | 15.0 | 33.1 | 1.8 |
| 9 months | 98.6 | 3' 3" | 3.8 | 15.1 | 33.3 | 1.8 |
| 10 months | 99.1 | 3' 3" | 3.8 | 15.3 | 33.7 | 1.9 |
| 11 months | 99.7 | 3' 3" | 3.9 | 15.4 | 34.0 | 1.9 |
| 4 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 100.2 | 3' 3" | 3.9 | 15.6 | 34.4 | 2 |
| 1 months | 100.8 | 3' 4" | 3.9 | 15.8 | 34.8 | 2 |
| 2 months | 101.3 | 3' 4" | 4 | 15.9 | 35.1 | 2.1 |
| 3 months | 101.9 | 3' 4" | 4 | 16.1 | 35.5 | 2.1 |
| 4 months | 102.4 | 3' 4" | 4 | 16.3 | 35.9 | 2.1 |
| 5 months | 103.0 | 3' 5" | 4.1 | 16.4 | 36.2 | 2.1 |
| 6 months | 103.5 | 3' 5" | 4.1 | 16.6 | 36.6 | 2.1 |
| 7 months | 104.0 | 3' 5" | 4.1 | 16.7 | 36.8 | 2.2 |
| 8 months | 104.6 | 3' 5" | 4.2 | 16.9 | 37.3 | 2.2 |
| 9 months | 105.1 | 3' 5" | 4.2 | 17.0 | 37.5 | 2.2 |
| 10 months | 105.6 | 3' 6" | 4.3 | 17.3 | 38.1 | 2.3 |
| 11 months | 106.2 | 3' 6" | 4.3 | 17.5 | 38.6 | 2.4 |
| 5 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 106.7 | 3' 6" | 4.3 | 17.7 | 39.0 | 2.5 |
| 1 months | 107.3 | 3' 6" | 4.4 | 17.9 | 39.5 | 2.6 |
| 2 months | 107.8 | 3' 6" | 4.4 | 18.1 | 39.9 | 2.8 |
| 3 months | 108.3 | 3' 7" | 4.4 | 18.3 | 40.3 | 2.9 |
| 4 months | 108.9 | 3' 7" | 4.5 | 18.5 | 40.8 | 2.9 |
| 5 months | 109.4 | 3' 7" | 4.5 | 18.7 | 41.2 | 2.9 |
| 6 months | 110.0 | 3' 7" | 4.5 | 18.9 | 41.7 | 3 |
| 7 months | 110.5 | 3' 8" | 4.6 | 19.1 | 42.1 | 3 |
| 8 months | 111.1 | 3' 8" | 4.6 | 19.3 | 42.5 | 3 |
| 9 months | 111.6 | 3' 8" | 4.7 | 19.6 | 43.2 | 3 |
| 10 months | 112.2 | 3' 8" | 4.7 | 19.8 | 43.7 | 3.1 |
| 11 months | 112.7 | 3' 8" | 4.7 | 20.1 | 44.3 | 3.2 |
| 6 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 113.3 | 3' 9" | 4.8 | 20.3 | 44.8 | 3.3 |
| 1 months | 113.9 | 3' 9" | 4.8 | 20.6 | 45.4 | 3.4 |
| 2 months | 114.5 | 3' 9" | 4.8 | 20.8 | 45.9 | 3.5 |
| 3 months | 115.0 | 3' 9" | 4.9 | 21.1 | 46.5 | 3.5 |
| 4 months | 115.6 | 3' 10" | 4.9 | 21.3 | 47.0 | 3.6 |
| 5 months | 116.1 | 3' 10" | 4.9 | 21.6 | 47.6 | 3.7 |
| 6 months | 116.7 | 3' 10" | 5 | 21.8 | 48.1 | 3.8 |
| 7 months | 117.2 | 3' 10" | 5 | 22.0 | 48.5 | 3.8 |
| 8 months | 117.7 | 3' 10" | 5 | 22.2 | 48.9 | 3.9 |
| 9 months | 118.2 | 3' 11" | 5 | 22.5 | 49.6 | 3.9 |
| 10 months | 118.6 | 3' 11" | 5 | 22.7 | 50.0 | 4 |
| 11 months | 119.1 | 3' 11" | 5 | 22.9 | 50.5 | 4 |
| 7 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 119.6 | 3' 11" | 5.1 | 23.1 | 50.9 | 4.1 |
| 1 months | 120.1 | 3' 11" | 5.1 | 23.3 | 51.4 | 4.2 |
| 2 months | 120.6 | 3' 11" | 5.1 | 23.5 | 51.8 | 4.2 |
| 3 months | 121.1 | 3' 12" | 5.1 | 23.8 | 52.5 | 4.3 |
| 4 months | 121.5 | 3' 12" | 5.1 | 24.0 | 52.9 | 4.3 |
| 5 months | 122.0 | 4' 0" | 5.1 | 24.2 | 53.4 | 4.4 |
| 6 months | 122.5 | 4' 0" | 5.1 | 24.4 | 53.8 | 4.4 |
| 7 months | 123.0 | 4' 0" | 5.2 | 24.7 | 54.5 | 4.5 |
| 8 months | 123.4 | 4' 1" | 5.2 | 25.0 | 55.1 | 4.6 |
| 9 months | 123.9 | 4' 1" | 5.2 | 25.2 | 55.6 | 4.7 |
| 10 months | 124.4 | 4' 1" | 5.2 | 25.5 | 56.2 | 4.8 |
| 11 months | 124.8 | 4' 1" | 5.3 | 25.8 | 56.9 | 4.9 |
| 8 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 125.3 | 4' 1" | 5.3 | 26.1 | 57.5 | 5 |
| 1 months | 125.8 | 4' 2" | 5.3 | 26.3 | 58.0 | 5.1 |
| 2 months | 126.2 | 4' 2" | 5.3 | 26.6 | 58.6 | 5.2 |
| 3 months | 126.7 | 4' 2" | 5.4 | 26.9 | 59.3 | 5.3 |
| 4 months | 127.2 | 4' 2" | 5.4 | 27.2 | 60.0 | 5.4 |
| 5 months | 127.6 | 4' 2" | 5.4 | 27.4 | 60.4 | 5.5 |
| 6 months | 128.1 | 4' 2" | 5.5 | 27.7 | 61.1 | 5.6 |
| 7 months | 128.6 | 4' 3" | 5.5 | 28.0 | 61.7 | 5.7 |
| 8 months | 129.0 | 4' 3" | 5.5 | 28.3 | 62.4 | 5.8 |
| 9 months | 129.5 | 4' 3" | 5.5 | 28.6 | 63.1 | 5.9 |
| 10 months | 129.9 | 4' 3" | 5.5 | 28.9 | 63.7 | 6 |
| 11 months | 130.4 | 4' 3" | 5.6 | 29.2 | 64.4 | 6.1 |
| 9 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 130.9 | 4' 4" | 5.6 | 29.5 | 65.0 | 6.2 |
| 1 months | 131.3 | 4' 4" | 5.6 | 29.7 | 65.5 | 6.3 |
| 2 months | 131.8 | 4' 4" | 5.6 | 30.0 | 66.1 | 6.4 |
| 3 months | 132.2 | 4' 4" | 5.7 | 30.3 | 66.8 | 6.5 |
| 4 months | 132.7 | 4' 4" | 5.7 | 30.6 | 67.5 | 6.6 |
| 5 months | 133.1 | 4' 4" | 5.7 | 30.9 | 68.1 | 6.7 |
| 6 months | 133.6 | 4' 5" | 5.7 | 31.2 | 68.8 | 6.8 |
| 7 months | 134.1 | 4' 5" | 5.8 | 31.5 | 69.4 | 6.9 |
| 8 months | 134.5 | 4' 5" | 5.8 | 31.9 | 70.3 | 7 |
| 9 months | 135.0 | 4' 5" | 5.8 | 32.2 | 71.0 | 7.1 |
| 10 months | 135.4 | 4' 5" | 5.9 | 32.5 | 71.7 | 7.2 |
| 11 months | 135.9 | 4' 6" | 5.9 | 32.8 | 72.3 | 7.3 |
| 10 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 136.4 | 4' 6" | 5.9 | 33.2 | 73.2 | 7.4 |
| 1 months | 136.8 | 4' 6" | 6 | 33.5 | 73.9 | 7.5 |
| 2 months | 137.3 | 4' 6" | 6 | 33.8 | 74.5 | 7.6 |
| 3 months | 137.7 | 4' 6" | 6 | 34.1 | 75.2 | 7.7 |
| 4 months | 138.2 | 4' 6" | 6.1 | 34.5 | 76.1 | 7.8 |
| 5 months | 138.6 | 4' 7" | 6.1 | 34.8 | 76.7 | 7.8 |
| 6 months | 139.1 | 4' 7" | 6.1 | 35.1 | 77.4 | 7.9 |
| 7 months | 139.6 | 4' 7" | 6.2 | 35.5 | 78.3 | 8 |
| 8 months | 140.1 | 4' 7" | 6.3 | 35.8 | 78.9 | 8.1 |
| 9 months | 140.7 | 4' 7" | 6.4 | 36.2 | 79.8 | 8.2 |
| 10 months | 141.2 | 4' 8" | 6.5 | 36.5 | 80.5 | 8.3 |
| 11 months | 141.7 | 4' 8" | 6.6 | 36.9 | 81.4 | 8.4 |
| 11 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 142.2 | 4' 8" | 6.6 | 37.3 | 82.2 | 8.5 |
| 1 months | 142.7 | 4' 8" | 6.7 | 37.6 | 82.9 | 8.6 |
| 2 months | 143.2 | 4' 8" | 6.8 | 38.0 | 83.8 | 8.7 |
| 3 months | 143.8 | 4' 9" | 6.9 | 38.3 | 84.4 | 8.8 |
| 4 months | 144.3 | 4' 9" | 7 | 38.7 | 85.3 | 8.9 |
| 5 months | 144.8 | 4' 9" | 7.1 | 39.0 | 86.0 | 9 |
| 6 months | 145.3 | 4' 9" | 7.1 | 39.4 | 86.9 | 9.2 |
| 7 months | 145.9 | 4' 9" | 7.2 | 39.9 | 88.0 | 9.3 |
| 8 months | 146.6 | 4' 10" | 7.3 | 40.4 | 89.1 | 9.4 |
| 9 months | 147.2 | 4' 10" | 7.4 | 40.9 | 90.2 | 9.5 |
| 10 months | 147.8 | 4' 10" | 7.4 | 41.4 | 91.3 | 9.6 |
| 11 months | 148.5 | 4' 10" | 7.5 | 41.9 | 92.4 | 9.7 |
| 12 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 149.1 | 4' 11" | 7.6 | 42.4 | 93.5 | 9.8 |
| 1 months | 149.7 | 4' 11" | 7.7 | 42.9 | 94.6 | 9.9 |
| 2 months | 150.4 | 4' 11" | 7.8 | 43.4 | 95.7 | 10 |
| 3 months | 151.0 | 4' 11" | 7.8 | 43.9 | 96.8 | 10.1 |
| 4 months | 151.6 | 4' 12" | 7.9 | 44.4 | 97.9 | 10.2 |
| 5 months | 152.3 | 4' 12" | 8 | 44.9 | 99.0 | 10.3 |
| 6 months | 152.9 | 5' 0" | 8.1 | 45.4 | 100.1 | 10.4 |
| 7 months | 153.5 | 5' 0" | 8 | 45.8 | 101.0 | 10.4 |
| 8 months | 154.1 | 5' 1" | 8 | 46.2 | 101.9 | 10.4 |
| 9 months | 154.7 | 5' 1" | 8 | 46.7 | 103.0 | 10.4 |
| 10 months | 155.3 | 5' 1" | 7.9 | 47.1 | 103.8 | 10.4 |
| 11 months | 155.9 | 5' 1" | 7.9 | 47.5 | 104.7 | 10.4 |
| 13 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 156.5 | 5' 2" | 7.9 | 47.9 | 105.6 | 10.4 |
| 1 months | 157.0 | 5' 2" | 7.8 | 48.3 | 106.5 | 10.4 |
| 2 months | 157.6 | 5' 2" | 7.8 | 48.7 | 107.4 | 10.5 |
| 3 months | 158.2 | 5' 2" | 7.8 | 49.2 | 108.5 | 10.5 |
| 4 months | 158.8 | 5' 3" | 7.8 | 49.6 | 109.3 | 10.5 |
| 5 months | 159.4 | 5' 3" | 7.7 | 50.0 | 110.2 | 10.5 |
| 6 months | 160.0 | 5' 3" | 7.7 | 50.4 | 111.1 | 10.5 |
| 7 months | 160.5 | 5' 3" | 7.6 | 50.8 | 112.0 | 10.5 |
| 8 months | 160.9 | 5' 3" | 7.5 | 51.2 | 112.9 | 10.5 |
| 9 months | 161.4 | 5' 4" | 7.4 | 51.7 | 114.0 | 10.4 |
| 10 months | 161.8 | 5' 4" | 7.3 | 52.1 | 114.9 | 10.4 |
| 11 months | 162.3 | 5' 4" | 7.2 | 52.5 | 115.7 | 10.4 |
| 14 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 162.8 | 5' 4" | 7.1 | 52.9 | 116.6 | 10.4 |
| 1 months | 163.2 | 5' 4" | 7 | 53.3 | 117.5 | 10.4 |
| 2 months | 163.7 | 5' 4" | 6.9 | 53.7 | 118.4 | 10.4 |
| 3 months | 164.1 | 5' 5" | 6.8 | 54.2 | 119.5 | 10.4 |
| 4 months | 164.6 | 5' 5" | 6.7 | 54.6 | 120.4 | 10.4 |
| 5 months | 165.0 | 5' 5" | 6.6 | 55.0 | 121.3 | 10.4 |
| 6 months | 165.5 | 5' 5" | 6.5 | 55.4 | 122.1 | 10.3 |
| 7 months | 165.8 | 5' 5" | 6.4 | 55.8 | 123.0 | 10.4 |
| 8 months | 166.0 | 5' 5" | 6.4 | 56.1 | 123.7 | 10.4 |
| 9 months | 166.3 | 5' 5" | 6.3 | 56.5 | 124.6 | 10.5 |
| 10 months | 166.5 | 5' 6" | 6.3 | 56.8 | 125.2 | 10.5 |
| 11 months | 166.8 | 5' 6" | 6.2 | 57.2 | 126.1 | 10.5 |
| 15 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 167.1 | 5' 6" | 6.2 | 57.6 | 127.0 | 10.6 |
| 1 months | 167.3 | 5' 6" | 6.1 | 57.9 | 127.6 | 10.6 |
| 2 months | 167.6 | 5' 6" | 6.1 | 58.3 | 128.5 | 10.7 |
| 3 months | 167.8 | 5' 6" | 6 | 58.6 | 129.2 | 10.7 |
| 4 months | 168.1 | 5' 6" | 6 | 59.0 | 130.1 | 10.7 |
| 5 months | 168.3 | 5' 6" | 5.9 | 59.3 | 130.7 | 10.8 |
| 6 months | 168.6 | 5' 6" | 5.9 | 59.7 | 131.6 | 10.8 |
| 7 months | 168.7 | 5' 6" | 5.9 | 59.8 | 131.8 | 10.8 |
| 8 months | 168.9 | 5' 6" | 5.9 | 60.0 | 132.3 | 10.7 |
| 9 months | 169.0 | 5' 7" | 5.9 | 60.1 | 132.5 | 10.7 |
| 10 months | 169.1 | 5' 7" | 5.9 | 60.2 | 132.7 | 10.6 |
| 11 months | 169.2 | 5' 7" | 5.8 | 60.3 | 132.9 | 10.5 |
| 16 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 169.4 | 5' 7" | 5.8 | 60.5 | 133.4 | 10.5 |
| 1 months | 169.5 | 5' 7" | 5.8 | 60.6 | 133.6 | 10.4 |
| 2 months | 169.6 | 5' 7" | 5.8 | 60.7 | 133.8 | 10.4 |
| 3 months | 169.7 | 5' 7" | 5.8 | 60.8 | 134.0 | 10.3 |
| 4 months | 169.9 | 5' 7" | 5.8 | 61.0 | 134.5 | 10.2 |
| 5 months | 170.0 | 5' 7" | 5.8 | 61.1 | 134.7 | 10.2 |
| 6 months | 170.1 | 5' 7" | 5.8 | 61.2 | 134.9 | 10.1 |
| 7 months | 170.2 | 5' 7" | 5.8 | 61.3 | 135.1 | 10.1 |
| 8 months | 170.2 | 5' 7" | 5.8 | 61.4 | 135.4 | 10.2 |
| 9 months | 170.3 | 5' 7" | 5.8 | 61.6 | 135.8 | 10.2 |
| 10 months | 170.3 | 5' 7" | 5.8 | 61.7 | 136.0 | 10.2 |
| 11 months | 170.4 | 5' 7" | 5.8 | 61.8 | 136.2 | 10.2 |
| 17 year-old | cm | feet | SD | kg | pounds | SD |
| 0 months | 170.5 | 5' 7" | 5.8 | 61.9 | 136.5 | 10.2 |
| 1 months | 170.5 | 5' 7" | 5.8 | 62.0 | 136.7 | 10.2 |
| 2 months | 170.6 | 5' 7" | 5.8 | 62.1 | 136.9 | 10.3 |
| 3 months | 170.6 | 5' 7" | 5.8 | 62.3 | 137.3 | 10.3 |
| 4 months | 170.7 | 5' 7" | 5.8 | 62.4 | 137.6 | 10.3 |
| 5 months | 170.7 | 5' 7" | 5.8 | 62.5 | 137.8 | 10.3 |
| 6 months | 170.8 | 5' 7" | 5.8 | 62.6 | 138.0 | 10.3 |
Source is www.suku-noppo.jp/data/
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