Girlfriend talks to me with a baby voice?

So, my Girlfriend works are a Teacher so works with little kids at her school - she likes her job and would really like kids one day - she admitted.

I am 22 and she is 25 and we have together for just over a year.

I notice that regularly she speaks and talks to me like a baby like she's addressing a child it's quite embarrassing in public - a lot of people stare like their's something wrong.

Is this normal or should I be concerned - I don't mind her talking like that at home but out in public it is quite embarrassing.
Girlfriend talks to me with a baby voice?
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