Bye Bye???

So in the video below Kai waves "bye bye" to the camera...but I realized that he also said "bye bye". I thought it was a coincidence at first but then he has said "bu bu" every time we wave bye bye to him. This may very well be his first word. He has said mama & dada for a while but not descriminately. So, there you go, bye bye is his first word! Does that mean we are saying bye to him a lot? Probably, but we are also around a lot of people all the time so he is told to tell people goodbye a lot, not necessarily his parents:)