11. Others postulate that the sinuses evolved as part of our speech development to help the voice resonate. 12. Handling children with problems in speech development in " Medicine in Metamorphosis ", Siirala's attitude comes clear. 13. Periods of conductive hearing loss from otitis media may have a detrimental effect on speech development in children. 14. Even the minimal treatment Baby T received could have lasting consequences, including problems in speech development and hearing. 15. His speech development was also slow, and he retained a stammer, or hesitant speech, for the rest of his life. 16. The father's resentment of the close bond between Paulie and Marie, and their shared progress in speech development is evident. 17. Whether early mouth movements also relate to speech development is not known, though girls usually do talk before boys, Hepper said. 18. This coincides with the higher mobility of boys, accompanied by their lower rates of speech development in childhood, in comparison to girls. 19. There appears to be no strong evidence that using a pacifier delays speech development by preventing babies from practicing their speaking skills. 20. Autism impedes speech development and impairs the ability to relate to people and events, and firefighters feared that John might fight the rescue.