You can determine your baby's gender by the position of sexual intercourse and you can predict it by how you are carrying.
The position of intercourse has no clear effect on a baby's gender, the gender of your baby is determined by the sperms of father. If sperms carrying an X-chromosome fertilizes the egg the baby will be a girl and if the sperm carrying a Y-chromosome fertilizes the egg, a boy will result. Also the way you carry your baby, has nothing to do with its sex. It depends on many factors like the build of the mother, the size and position of the baby, and the amount of fluid around the baby. There is no correlation whatsoever with the sex of the baby.