So, I read an old wives tale that said if you pee in a cup with baking soda in it, the reaction would tell you if it was a boy or a girl. If the urine fizzed up like a soda, it was a boy. If the urine stayed flat (no bubbles), it was a girl. I tried it a month ago and it was flat. I didn't get excited because it is, after all, an old wives tale. But at my anatomy scan this morning it was confirmed..... It's a girl! Has anyone ever heard of this old wives tale?