At 11-13 weeks, all babies are believed to have a 'nub' between their legs called the genital tubercle, and according to the Nub Theory, the angle indicates the baby's sex.
It’s said that if the nub is over 30 degrees up from the spine, it’s a boy – but if it’s under that then it’s a girl.
The below pictures provide examples of the theory:
In the above picture, the nub theory isn't pointing up more than 30 degrees from the spine, so believers in this theory would say the scan showed a little girl.
In the above picture, the nub appears to be at a much steeper angle from the spine, indicating that this could be a baby boy.
Netmums have reported the following statistics inline with the nub theory:
- At 11 weeks, the accuracy rate is 48 per cent
- At 12 weeks, the accuracy rate is 91 per cent
- At 13 weeks, the accuracy rate is 94 per cent
Have you had success with the Nub Theory? Head to our Facebook page to let us know!