My Mom and I where having an argument about this.
I said that she shouldn't "baby talk" small children. I say this because when you are young, the best way to learn something is by seeing other people do it and then trying to mimic them. This works with languages, such as English. When a child is learning English, they would assume everyone around them is speaking English. Having someone talk nonsensical modifications of English words to them, would confuse them and make them misinterpret those words as words of the actual English language. This would harm their learning process, and would keep them confused until they are old enough for people to stop babying them. She came up with the arguement, "well you don't know what it's like being an adult, you would look back at this and say wow" blah.
Hint: My mom doesn't like being wrong.