Sep 25, 2012 Bye Bye Our baby has become a little man, and he has learned what "bye bye" means. Whenever you leave and wish him goodbye, he responds by waving his hand saying "bye bye". He says it so nicely that you don't even want to leave. Perhaps that is part of his genious plan...to look so adorable that you don't leave. Next, we have to teach him to say "hello" and "hi".