What age is a child's immune system fully developed?

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  2. #becomes
  3. #mediated
  4. #viruses
  5. #child
  6. #important
  7. #immune
  8. #especially
  9. #infant
  10. #around
  11. #fight
  12. #months
  13. #those
  14. #first
  15. #helping
  16. #developed
  17. #system
  18. #sabella
  19. #until
  20. #immunity
  21. #mature