| Parents blood type | Blood type of the child | Blood type that children won't have |
|---|---|---|
| O+O | O | A、B、AB |
| O+A | A、O | B、AB |
| O+B | B、O | A、AB |
| O+AB | A、B | O、AB |
| A+A | A、O | AB、B |
| A+B | AB、A、B、O | |
| A+AB | A、B、AB | O |
| B+B | B、O | A、AB |
| B+AB | A、B、AB | O |
| AB+AB | A、B、AB | O |
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