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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.
You can also skip the hot water and see if the baking soda fizzes just by dropping some directly into 3 tablespoons of white distilled vinegar. You do the same exact testâ just without vinegar! 1  Measure out a half cup of hot water.  Drop a bit of the baking powder into the hot water.