You add urine to baking soda. If it fizzes then it means you are supposedly having a boy. If nothing happens then you are supposedly having a girl. From what I know this is based on that when women are pregnant with boys their urine is usually more acidic.
Its just for fun really. I;ve tried it this pregnancy. More than twice I get no fizz every time. But a scan at 12+5 shows that i'm probably having a boy. Kind of early I know, I'll let you know in a couple of weeks if it was right.
I think its just a fluke. Wee that is more acidic will make baking soda fizz (try it with vinegar...its fun!) and no fizz with more alkaline wee. Its the same way the intelligender tests work. I think the idea is that if your carrying a boy then it makes your wee more acidic. I really wish it did work as I would love a girl, but 12 week scan really does look boy.
Oh, and I mean pour vinegar on the baking soda, not pee on the vinegar.
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