The nub theory performs on the basis that from 12 months, boys' genitals (or perhaps the genital tuber, as they aren't really properly formed bits and items at this stage, and each sexes will have a little bit tube- like protrusion) might be angled in different ways to the women', https://week12genderprediction33320.frewwebs.com/27867227/the-definitive-guide-to-ramzi-theory-ultrasound