This trick is only superstition/old wives tale, so it is not proven to
work at all, but it is supposed to be performed on a pregnant woman's
belly.
I am believe in only IntelliGender products which is provide Gender Predictions test. Its very easy and done at home.
I suggest only one thing for Baby Gender Prediction. IntelliGender Gender Prediction is best way to know Baby Boy or Girl. IntelliGender provide best services at home without any side effects with guarantee.