How accurate is the nub theory at 13 weeks?
How accurate is the nub theory at 13 weeks? Tested with 656 patients, Nub Theory was able to determine baby's sex 96 percent of the time when used between 12 weeks 4 days and 12 weeks 6 days (and 97 percent of the time when used between 13 weeks and 13 weeks 6 days). It accurately identified males 99 to 100 percent of the time. Does the nub theory work at 13 weeks? Nub theory is about 97 percent accurate, but only when performed by a trained scientist or doctor at 13 weeks or later, research indicates. But if said...