Waving

We have been trying to teach Liem to wave bye-bye for months. Every morning the conversation would go something like this:
Daddy: Bye bye Mummy! (Wave at Mummy)
Mummy: Bye bye Daddy! (Wave at Daddy)
Daddy: Bye bye Liem! (Wave at Liem and wait for his response...)
Nothing...no wave...for months...

Now, he waves...all the time...with both hands....and often at the wrong person (not the one actually leaving)....sigh...

Oh, and check out his bottom teeth.... it's really hard trying to get a good photo of his teeth.... I must have tried at least 6 times and sometimes I got the side of his head or the top of his head or worse his head wasn't even in the photo... 4 teeth now...2 at the bottom and 2 at the top.