There’s a ton of videos and articles on it, I think the kardashians did it too on one of the episodes
You take a strand of your hair and a ring, doesn’t need to be your wedding ring or engagement ring but a ring you own. Loop the ring with your hair. You hold your left hand out flat and bounce the ring to the right side of your hand, then to the left, then to the right, and then over the middle of your palm. If it swings in a circle, you will have a girl. If it swings back and forth, you will have a boy. If it stops dead in the middle without much movement, it means no children. You can keep doing it until it stops in the middle of your palm if it’s telling you multiple children.
It’s best to have someone else bounce the ring over your hand.
It sounds crazy, but we’ve even tried it on people we know that’s accurately given the correct genders and order of children.
My coworker is a chemist and doesn’t usually believe in this stuff. She did it 5 years ago and it said boy and girl. She had a boy first a couple years ago