Hover over the point where the column matching your age and the row matching the month of conception cross.
| Mother's Chinese Age at Conception | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month of Conception | 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 |
| Jan | 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 |
| Feb | 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 |
| Mar | G | B | G | G | B | G | B | B | B | G | B | G | G | B | B | B | B | G | B | B | G | B | G | B | G | B | G | B |
| Apr | 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 |
| May | 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 |
| Jun | B | B | B | G | G | G | B | B | B | B | G | B | G | G | G | G | G | G | G | B | G | G | B | G | B | G | B | G |
| Jul | 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 |
| Aug | 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 |
| Sep | B | B | B | G | G | B | G | B | G | B | B | B | G | G | G | G | G | G | B | G | B | G | B | G | B | B | G | B |
| Oct | B | B | G | G | G | B | G | B | G | B | B | G | G | G | G | G | G | G | B | B | G | B | G | B | G | B | B | G |
| Nov | 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 |
| Dec | 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 |