No, us neither. But it's something that has clearly preoccupied a South African geneticist - who has gone to the painstaking trouble of creating predictive images of the new royal - as a toddler and a teenager- even though he or she hasn't been born yet.
Anyway, it's fun to speculate, so why not? Geneticist Suretha Erasmus has produced two lots of images because the world does not even know if Kate and William's baby, due in July, is a boy or girl.
Her pictures show a girl with Kate's defined eyebrows and large, pretty eyes, but a mouth that is a mixture of Kate and William's smiles. Her male version looks more like William with smaller eyes and bushier eyebrows.
Clearly, from these pictures the child is not going to be short of admirers, whether it's a prince or princess.
And the pictures are certainly a lot better than these demon ones which preceded the royal wedding.