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Sep 2013. Posts. 1,612. You put a table spoon of baking powder into a cup and add your urine to it. If it fizzes it means your having a boy and if there's no reaction it means your having a girl. It supposed to work on the theory that if you are pregnant with a boy your wee is more acidic. Therefore causing a similar reaction to if you had added vinegar. Baby no2 Due ð¼11-01-2015 ð¼.
Report Abuse. Baking powder and baking soda are almost the same thing, but baking powder has a heat activated acid that causes it to produce CO2 when its in the oven. hence the term 'doulbe acting'. Powder also needs an acid to activate it. Baking soda is used mainly for adjusting the pH of a baked good.