What does variability mean in fetal heart rate?

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Tags

1. #given
2. #period
3. #beats
4. #amount
5. #heart
6. #there
7. #fetal
8. #means
9. #variability
10. #absent
11. #fetus
12. #varies
13. #between
14. #moderate
15. #minute
16. #difference
17. #second