"Mama"

You can learn a lot about Oliver from this video.

Note how he charms his Mummy with his adorable intonation of "Mama".
See how he insists that she acknowledges him saying "Dada", but equally will say Mama when she's saying Dada.
And finally when he has finished his meal he gives us a clear signal (the hand waving) this is the case... and that we can clear up for him. Note that the video ends here as we dutifuly jump into action!

There's a slightly earlier video of him saying Mama and laughing, but for some reason the sound is out of sync on YouTube. (Still cute though!)