What happens if mother is Rh positive and father is Rh negative?

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Tags

1. #mother
2. #happens
3. #birth
4. #cells
5. #cross
6. #person
7. #blood
8. #placenta
9. #factor
10. #sensitized
11. #positive
12. #father
13. #breaks
14. #negative
15. #issue
16. #often
17. #becomes