Do ultrasound waves harm a fetus?

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  1. #developing
  2. #found
  3. #power
  4. #causing
  5. #uterus
  6. #either
  7. #placenta
  8. #mother
  9. #pregnancy
  10. #waves
  11. #ultrasound
  12. #heard
  13. #sound
  14. #evidence