It's one thing to use baby talk with an infant, (hence the baby talk moniker), and another to speak that way to a child that is actually learning to form words and construct a sentence.
Use whatever voice you prefer with your pets. Dogs actually enjoy the soft sounds of baby talk. A bit of brilliant manipulation of humans by the dogs.
As a boomer, reading this thread/discussion has been so amusing in many ways while enjoying my cuppa tea this morning. A classic "the younger generations are stupid."
The older generations looking down the ones that follow. And the following generations looking down on those that precede them. And no one understanding ain't none of us are all that bright.
Ever has it been, and so ever shall it be.