Ok, i'm going to try this with you girls. If its not clear, let me know. I will try to explain again the way to do it better!! I got this from a friend...

Take your hand palm facing up, with your thumb seperated from the rest of your fingers and in your other hand take a chain-type necklace with a charm at the end of it, hold the necklace above your hand, dip the charm end of the necklace between your thumb and your hand (make sure not to hit your hand with the necklace) three times, then place the necklace dangling above your palm (make sure to not move the necklace with your fingers) and wait and see if the charm moves back and forth that means boy, if it moves in a circle that means girl. Leave the necklace over your hand until it stops completely and if it stops that means no more kids.