How can you tell if your having a boy or a girl.by the way your carrying or it or by the way the other babies inter act with the fetus?

Neither.: It doesn't matter how you are carrying the baby, whether s/he kicks, whether a gold ring dangling from a chain goes back and forth or around in circles, or any other old wives tale. Each pregnancy you have exactly a 50:50 chance of getting one or the other gender. Sex can be determined by ultrasound or amniocentesis (some of the amniotic flood is take with a needle and tested).