Personally, I don't think that how you carry has anything to do with the sex of the baby. I think it probably has more to do with your body, the baby's preferred position, where your placenta is, etc etc.
BUT, I will say that this is pregnancy #2, baby boy #2, and I carried high and straight out front with both boys. Of course, I'm 5'2" and there's really not much space to put a baby on me otherwise. :LOL
may my heart always be open to little birds who are the secrets of living whatever they sing is better than to know - e.e. cummings