N.P.
When my five year old started doing that I told her that was "baby talk" and that nipped that in the bud. I told her if she's going to talk like a baby, I'll treat her like one. Milk, and only milk, for every meal and no more fruit snacks.
Her eyes widened, "No more fruit snacks... ever?!?"
I replied, "Not until you grow up. Only big girls have nice teeth to chew up fruit snacks. Babies can't eat fruit snacks. It's not good for them."
No more baby talk.