This is the Thanks I Get?

Last night while bathing Carsten, I was trying to teach him to call me "Ma-ma". He babbles it occasionally, but I am not sure if he knows that I am "Ma-ma". So, we practiced...

Me: Carsten, can you say "Ma-ma"? Say "Ma-ma".
Carsten: "Da-da"
Me: No, say "Ma-ma". "Ma-ma, Ma-ma, Ma-ma"
Carsten: "Da-da, Da-da, Da-da"
Me: "Ma-ma, Ma-ma, Ma-ma, Ma-ma, Ma-ma"
Carsten: "Da-da"

He knows "Da-da".

I carried this child for 9 months. I pushed this child into the world for 2 long painful hours. All "Da-da" did was contribute his DNA.