Why is it so astonishing?

This probably will be a short one.
I just wanted to share a typical sequence which has happened so many times off late.

We go out, we meet someone and they say - 'Oh how cute...how old is she now?'
Mom / Dad: She is eight months....
These days its changed to 'she is close to 9 months'
Response to that: Really?? OMG and how many teeth does she have?
Mom / Dad: Six
Response to that: Wooooow!! That is unbelievable....OR That is awesome OR That's cool

I wonder why do they find it so strange that I have six teeth...When I cant even count how many they have!! Probably having six when I just turned eight months might be a lil hard to believe :)