The present study investigated German-learning 6-month-old infants' preference for visual speech. Visual stimuli in the infants' native language (German) were contrasted with stimuli in a foreign language with similar rhythmical characteristics (English). In a visual preference task, infants were presented with 2 side-by-side silent video clips of the same speaker reciting a nursery rhyme simultaneously in German and English. To assess spontaneous preference for native or non-native visual speech, we computed preference scores towards the English- and German-speaking faces. The findings of the present study revealed a sex difference in visual speech preference. Only female infants exhibited a visual preference, by attending longer to the English-speaking face. Notably, the present study provides the first evidence for sex differences in visual speech preference in infancy.