Good Cop, Bad Cop

As Flaily's audio equipment is evolving, it sometimes gives us licence to say odd things to the bump. 

W: (after a kicking fest) Bad baby!
Me: Hey, we don't want to give him a poor idea of himself.
W: A little chastisement is fine.
Me: I'm not so sure...

Pause, I get closer to the bump.

Me: Good baby!
W: Oh great, it's going to work like that eh? Mummy's all stern and horrible and Daddy's the nice one...?
Me: May be you could say, 'Good baby'?
W: He's kicking my bladder!
Me: Well he doesn't know that...
W: Ow! He did it again. Little rotter!
Me: I quite like that.
W: You want me to say 'Little rotter' instead?
Me: You say it so nicely...
W: So telling him off with a good voice is better? This could get very confusing for the little blighter.
Me: That's a good one, use that too.