Hah Nah?!?!?!

Gosh... I have been a bad bad mum.
I have been saying the wrong things in front of BB Caleb.
My pet phrase when my mum asked me questions.."Hah Nah Hah Nah"
BB Caleb has managed to pick up these words. So now, when we tell him dun do this, or this is so and so.. he will go hah nah hah nah...
Wow, its actually very frustrating to hear such replies. Now I definately know how my mum felt. I have to stop using this sentence...