The Ramzi Method is the earliest gender prediction to be used within the first trimester of pregnancy that detects fetal gender between gestation weeks 6-8. The Theory uses the placenta/chorionic villi location as a marker for fetal gender detection and found to be highly reliable. This method correctly predicts the fetus gender in 97.2% of males and 97.5% of females early in the first trimester.”
The idea behind The Skull Theory came from the Anthropological approach to the study of humans. Male skulls are known to be more blockier and large compared to the female skull which is more round and delicate, However these differences only develop during maturity and many believe in this theory (92% accuracy rating). Although there is no medical evidence to support this theory its a fun way to predict the gender.
During the first trimester of pregnancy the male and female genitalia that is developing changes between eleven and sixteen weeks gestation. The male and female foetus’ have a penis-like protrusion and as such look very similar except for one special element the angle of the protrusion, known as 'The Angle of The Dangle'.
A male foetal protrusion points approximately 30 degrees up relative to the backbone whilst a girls’ protrusion is below 30 degrees. Accuracy rating increases much nearer to week fifteen (99.6% males and 97.4% females).