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Before about 15 week gestation, both males and females have genital tubercles, also known as a nub. This is basically a small part of your baby’s anatomy that will eventually develop into their gender-specific genitals.   Determining gender is now possible between 12-14 weeks gestation by analyzing the angle and shape of the nub, also referred to as the “angle of the dangle.” The scan must be in profile view in order to allow viewing of the spine and the nub’s relationship to it. This angle is directly related to whether the child will be a boy or a girl.  


I have provided nub theory predictions for over 7 years and have acquired an accuracy of over 98%. Nub theory is fact and is backed by scientific evidence. Not just a "theory" and can be determined from just 12 weeks gestation.

How do we Predict The Nub Theory? After submitting your 12-14 week ultrasound scan, rather than waiting for your 20 week Anatomy Scan, We will check for visibility of the genital tubercle. Visibility may be affected by the position of the baby, the amount of amniotic fluid in the sac, thickness of abdominal wall, scan quality and/or resolution.

To determine gender, The Gender Experts use the following criteria:  

  • Visibility 

  • The angle of genital tubercle in relation to the spine 

  • Shadows and male markers on and surrounding tip of nub 

  • Shape, including length according to gestational age 

These factors will contribute to the nub theory being scientifically proven and provides an impressively accurate prediction of your baby’s gender. 

How early can I use the Nub Theory to know whether it will be a boy or girl?

Before 10 weeks of pregnancy, the genital tuber appears to be the same in both male and female fetus’. At 11 weeks, the accuracy is still around 50:50 as this is when the development stage takes place. From 12-14 the accuracy is 99.9% as long as a clear nub shot is seen.

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