What is---?

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Across
  1. 4. any person,place,or thing of interest to a child
  2. 7. using speech,signs,photos,speech device,or writing
  3. 9. convey a spontaneous message to begin an interaction function purpose or reason for communicating
  4. 13. use of physical closeness,gestures,gaze to convey a message
  5. 16. done to meet the needs of others
  6. 17. mutual social-communicative exchange; turn-taking interaction
  7. 19. sound produced using the lungs and voice box (larynx)
  8. 20. interactive exchange to convey needs,feelings,& ideas
  9. 21. nonsense speech that sounds like speech heard from 6-12 months
  10. 23. expression of communication based on shared sounds and signs
Down
  1. 1. early repetitive syllables heard around 6 months
  2. 2. something representing a real thing
  3. 3. ability to focus on relevant information
  4. 5. skills that serve as guides to normal development
  5. 6. interactive exchange between two or more people
  6. 8. restricted, repetitive and stereotypic patterns
  7. 10. persistent repetition of a speech, motor,thought pattern
  8. 11. using or following a model
  9. 12. movements that shapes voice into specific understandable sounds
  10. 14. repetition of something previously heard
  11. 15. an observable action
  12. 18. thinking,reasoning,problem-solving,understanding
  13. 22. active engagement in pleasurable activity