fortunate1 says > Then you won't want to listen to too many present-day Middle Eastern and South Asian pop songs, where women's voices are infantilised to a bizarre extent -to the point of aural pederasty, I'd say ;)
I have always had a hard time listening to that type of music. I wondered how they did it and how the people who hear it all the time can stand it. What I could never figure out was why all the music sounded so similar.
Reading your post, I could kind of see it. Their voices have always sounded overly high-pitched, whiny, and annoying to me but I can see how it could be an attempt to make themselves sound more childlike. It doesn't sound like children's voices singing to me but perhaps it would if they were singing in those languages.
Unlike the OP, I know some people like baby talk. I don't mind it myself (when a guy does it in a playful way and it's not done too often) but I can't equate that kind of music with any baby talk I've ever heard or would want to hear.
Woman, man! That's the way it should be Tarzan. [Tarzan and his mate]