Emma is four now, but her first sounds were "ba" at 9 1/2 months. She was 6 weeks premature. If you are concerned about hearing issues they can only perform additional hearing tests, but they have to be sedated. Good Luck!
Emma's Homepage:
http://homepage.mac.com/lsnowbarger/peanut/Menu60.html
Family Blog
http://snowbarger.blogspot.com/