I can only link to the abstracts because I got to things behind a school login. (Seriously, someone could make a tidy sum selling access to academic databases for ordinary schmucks who don't want to pay an arm and a leg for journal articles.) Two I got fer ya: Recognition of own-race and other-race faces by three-month-old infants and Similarity and difference in the processing of same- and other-race faces as revealed by eye tracking in 4- to 9-month-olds