i think AUS 5.5 is a UK 4.5 Fionas. I've heard that theory before but there's Japanese woman at our toddler group who is a UK size 2 and her babies were 8lb9oz and 9lbs13oz (her husband is caucasion and 6'3") and she didn't even TEAR, so i have to say i don't think it rings true for her anyway. As a theory it's been around a long time, a bit like a man's feet corresponding to his penis size...that one's never been true for me either. LOL.

Bx