1. baby talk - Noun
2. baby talk - Verb
the developing speech of a young child
an adult's imitation of the speech of a young child
Source: WordNetbaby-talk
I talk in that baby talk voice when I'm on TV, it's a put on. Paris Hilton
I don't want her to have a cat because she'll end up talking baby talk to the cat. That's the way it is, and how can a P. I. do that? Sue Grafton
Even adults have used “uggie” to mean “ugly” since the 19th century, perhaps in imitation of baby talk. Source: Internet
His passion is for questions such as these: Did you know that both derive from baby talk? Source: Internet
No baby talk, please: Venus Williams focused on tennis. Source: Internet