Umm... this is not "racism" as we normally mean it. This is a general preference of white faces to black faces, or vice versa. It is not the prejudice against people who have black or white faces simply because of that fact.
If the baby is racist then so am I. I generally find white caucasian features more attractive in a potential partner than I do other kinds, this doesn't mean that I have any sort of prejudice... it's just a general disposition, probably caused by the fact that where I lived as a child was not very racially diverse. It's no different to preferring blonde women over brunettes, or any other such thing.
Alex -- *preparing for the idiotic replies*
how can a baby possibly be racist thats the stupiest thing i have ever heard!!
a baby is brought up with white people = its family must be white
a baby is brought up with a coloured people = its family must be coloured,
thats why they reconise the colour of peoples faces or whatever!!
isn;t that obvious,