faces

[Annette Karmiloff-Smith]

I know there is research showing that infants prefer "beautiful"
(symmetrical) faces over others, but is there research showing that
they prefer children's faces over adult ones, or female over male
etc.? Or other such preferences?  Idem with voices.  I know they can
discriminate, and believe that they prefer motherese over
adult-directed speech, but do they show preference for child voices
over adult, female over male, etc.?
All info most appreciated.
thanks
Annette