Left hemisphere already specialised for language by two months of age

It's widely known that in the majority of people the left hemisphere is dominant for language. But how early does this lateralisation of function emerge? An obvious way to find out is to put babies in a brain scanner and see if their brains show the same left-sided preference for language, compared with other auditory stimuli, as is observed in adults. Of course, from a practical perspective, that's easier said than done.