中國在七百年前的皇家墓地裡發現了這幅生男生女圖。這幅圖現在保存在北京科學院。它已被成千上萬的人所證實。（據說其準確達99%）
豎行﹕懷孕的月份
橫行﹕年齡(懷孕時的歲數+ 9個月)
交叉處即為結果 (男孩或女孩)
| 母親年齡 /懷孕月份 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 |
| 1月 | G | B | G | B | G | B | B | G | B | G | B | G | B | B | B | G | B | B | G | B | G | B | G | B | G | B | B | G |
| 2月 | B | G | B | G | B | B | G | B | G | B | G | B | G | G | G | B | G | B | B | G | B | G | B | G | B | G | B | B |
| 3月 | G | B | G | G | B | G | B | B | B | G | B | G | G | B | B | G | B | G | B | B | G | B | G | B | G | B | G | B |
| 4月 | B | G | B | G | G | B | B | G | G | B | G | G | G | G | G | B | G | B | G | B | B | B | B | G | B | G | B | G |
| 5月 | B | G | B | G | B | B | G | G | G | G | G | B | G | G | G | G | G | G | B | G | B | B | G | B | G | B | B | G |
| 6月 | B | B | B | G | G | G | B | B | B | G | G | B | G | G | G | G | G | G | G | B | G | G | B | G | B | G | B | G |
| 7月 | B | B | B | G | G | B | B | G | G | B | B | B | G | G | G | G | G | G | G | G | B | G | B | B | G | B | G | B |
| 8月 | B | B | B | G | B | G | G | B | B | B | B | B | G | G | G | B | G | B | G | B | G | B | G | B | B | G | B | G |
| 9月 | B | B | B | G | G | B | G | B | G | B | B | B | G | G | G | G | G | B | B | G | B | G | B | G | B | B | G | B |
| 10月 | B | B | G | G | G | B | G | B | G | B | B | G | G | G | G | G | G | B | B | B | G | B | G | B | G | B | B | G |
| 11月 | B | G | B | G | G | B | G | B | G | G | G | G | B | G | G | G | B | B | B | G | B | G | B | G | B | B | G | B |
| 12月 | B | G | B | G | G | G | G | B | G | B | G | G | B | B | B | B | B | B | B | B | G | G | G | B | G | B | G | B |
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