Ramzi Theory

The Ramzi theory is a theory that was developed by a man named Dr Saad Ramzi in 2004.

The theory predicts that a baby’s gender can be predicted from as early as the 6 week ultrasound based on the location of the placenta.

According to research and studies, the Ramzi theory has an accuracy rate of 97.5% and is the most accurate between 6-8 weeks gestation.

When determining the Ramzi theory on an ultrasound, it is important to ascertain whether the scan was taken abdominally, or Trans-Vaginally as this affects which side would be the left or right as one will be a mirror image. That is why it is so important to send in your scan to be looked at individually. 

Ramzi theory predicts that if you are having a baby girl, your placenta will form on the left, and if you are having a baby boy, it will form on the right. As the placenta is newly forming, we are looking to establish where the chronic villi are forming. 

Nub Theory

The Nub, or more formally known as the ‘genital tubercle’, is the part of your baby’s anatomy that turns into a clitoris (if the baby is a girl), or a penis (if the baby is a boy). The genital tubercle, more commonly known as the “Nub” can be seen on an ultrasound from 12 weeks gestation.

There have been many studies conducted of the nub theory which have concluded that from 11 weeks gestation, the accuracy rate for gender prediction is 70% and at 13 weeks gestation the accuracy rate for gender prediction is 98%! (https://pubmed.ncbi.nlm.nih.gov/10380292/)

If you’re having a baby boy, there is usually visible stacking of the nub seen on an ultrasound and the angle of the nub in relation to the spine is greater than 30%.

If you are having a baby girl, the nub appears flatter and runs parallel to the spine.

Skull Theory

The Skull theory is a theory that predicts your baby’s gender from as early as the 12-week ultrasound.

The origin of the skull theory remains unknown; how-ever it is an extremely popular theory amongst pregnant women.

The theory states the following anatomical differences based on gender. 

Baby Girls tend to have a round skull shape with a small brow ridge. They have round chins and do not have prominent cheek bones.

Baby Boys tend to have a square skull shape and a defined brow ridge. Their chin shape is also very square and they have prominent cheek bones                                        

Anatomy Scans

Anatomy scans are taken by a sonographer around 20 weeks gestation. With a clear ""in between the legs shot" an experienced person can see the male or female reproductive parts. 


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