See all in Preschooler. But do they really work? Rush Delivery can be added on at any time. Nub theory is a good name for this analysis, because it really is just that: a theory, without much evidence behind it. Nub theory, explained. Before that, nub theory is no better than a guesstimate.
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The rapid changes between weeks can lead to a lot of incorrect predictions. On the other hand, giving birth to a "surprise baby" can add to the fun and excitement when the baby arrives. Anecdotally, some sites will tell you that the prediction is tremendously accurate.
Combining Ramzi, Nub and Skull Theories improves accuracy. There are no shortages of non-medical myths that promise to accurately predict the sex of your baby. B Temporal Ridge — this runs along the outer side of the upper skull creating the square shape of the upper head.
Combining Ramzi, Nub and Skull Theories improves accuracy.
Skull Theory guesses the gender of your baby based on skull size. Anecdotally, some sites will tell you that the prediction is tremendously accurate. If the nub is angled greater than a 30 degree angle in relation to the spine, it is likely a male fetus.