The Nub Theory


"I've waited 12 weeks already, how much more?"
- Very impatient mama who needs to know more!

What is the Nub theory?

The basics of the Nub theory are simple and straight forward (no pun intended), it's all about the angle of the genital tubercle. The confirmed boy nubs is usually angled upwards 30 degrees or more in relation to the spine, while nub theory girl says is either parallel or less than 30 degree from the spine. Several studies have been conducted and have found that, in controlled settings, nub theory ranges between 98% and 100% in accuracy. That is great odds for knowing your little one's gender before your doctor can confirm it!

For more information about what is the nub theory, here are a couple of the most recent studies conducted:
Ultrasound evaluation of fetal gender at 12–14 weeks
Fetal gender assignment by first‐trimester ultrasound

Want to read your Nub theory scan?

What is the nub on a baby scan? Both male and female start forming their genitalia in the very early weeks after conception, but it isn’t until 11-12 weeks that the differences can be seen. Although outward genitalia isn't fully formed until after 16 weeks, the angle of the genital tubercle can be seen from 11 to 15 weeks to determine gender. In the nub theory, there are two main struggles when trying to read your own ultrasound. Perhaps the trickiest part of reading your own ultrasound is being able to locate the nub. It is usually right under the legs, but because every image is different and babies like to move around during ultrasounds, it takes an expert eye to pinpoint it for sure. The second struggle is seeing more than just the basic angle, as at 11 and 12 weeks the boy nub might still be parallel, but with an expert eye the scrotum can began to be seen.

Nub Theory pictures

Nub theory examples

How read your own Nub theory ultrasound?

In order to be able to make a gender prediction the ultrasound in nub theory must display a profile view of the baby, and the nub must be visible, this can be a challenge because babies move and good profile views are hard to get. If you do achieve this image, here are the steps for nub method:

-Find the spine: The angle of the spine serves as a baseline to compare with the angle on the nub, which is our next step.

-Find the nub: It should be a defined white line along where the legs of the baby should be.

-Find the angle: Comparing the direction of the spine with nub, see if the angle is more or less than 30 degrees.

As mentioned above, in addition to the angle there are other factors that also need to be taken into consideration. Some believe that if a nub has some forking on the tip it is a male nub. Baby Gender Pros does not believe this to be true as we have seen make forked female nubs, however it is a marker that we look at closely. Shadowing above the nub or stacking are also markers that can be deciding factors towards our prediction.

Other gender prediction theories



Between 6 and 10 weeks

This baby gender prediction method uses the location of the placenta in early weeks of pregnancy to predict the gender of the baby. In controlled groups this method has been 97.5% accurate.

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From 11 weeks

This early gender prediction theory uses skull marker to differentiate male and female babies. Although no studies have been conducted, this DIY gender prediction has been claimed to be up to 92% accurate.

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The Nub Theory
Average rating:  
 26 reviews
by Hanna on The Nub Theory
Fabulous

Hi! Just wanted to let you know that my 20th week ultrasound said im expecting a boy, you were right!

by heather on The Nub Theory
boy

Yes it's boy. you were correct

by lucy on The Nub Theory
nice gift

I was gifted this at my baby shower. It was fun and correct.

by Stephanie on The Nub Theory
Right X's 3!

I had gender pros do all three tests.
Nub: BOY
Skull: BOY
Position of the placenta: BOY
And the results r in:
It's a BOY!

by carly on The Nub Theory
correct

got both my boys correct at 12 weeks. Very pleased.

by silva on The Nub Theory
the only ones!

I'm shook! everyone on the Facebook groups said Boy and you guys said girl. Obviously i thought you did it wrong and BAM here is my little Eloise Belle.
Thank you!

by helter on The Nub Theory
12 week girl!

I was told boy by a different site it looked like a boy but you guys said girl and you were right!

by Tiffany on The Nub Theory
Baby Girl

Both Ramzi and Nub were correct! I’m having a baby girl!🎀

by Carly on The Nub Theory

Was told twice my scan photo looked like a boy, confirmed ultrasound shows I’m having a girl 🙂 although wasn’t accurate for me it was still good fun!

by Harley on The Nub Theory
Thank you!

Everyone said boy and I was surprised when you told us girl, but you were right!!! You really do know how to read Nubs! Thank you!

by laura on The Nub Theory
Finally a girl!

I was skeptical but you said girl with Ramzi and nub and you were correct! Will definitely use for my next baby!

by Karla on The Nub Theory
Baby boy!

Results were right for me and i couldnt be happier.
Insent my pics in and results came back BOY. It was confirmed that baby is in fact a boy. This is our first boy and we’re so excited to meet him!

by Sophia Letming on The Nub Theory
The only ones!!

I asked on the facebook groups and everyone else said boy! You guys are the only ones that got it right! Thank you for predicting my little girl!!

by Luke on The Nub Theory
Fun!

This was fun! I sent my 12 week ultrasounds and was told 98% boy and today at 16 weeks it's a boy! I will (hopefully) use this again! thank you!

by Laura A. on The Nub Theory
We are over the moon excited!

You were correct it's a girl! We are over the moon excited! Thank you!

by Martyn D. on The Nub Theory
Will recommend to my friends!

Nub theory was correct for us! At 11 weeks you saw it would be a girl and you were right!

by Julie L. on The Nub Theory
Very happy with your service!

Every other "expert" on Facebook was saying it was a girl because the nub looked flat at 12.5 weeks, but you guys showed me the developing scrotum and were confident it would be a boy and you were right!

by laura on The Nub Theory
two girls

I send it my daughter's scans and you said girl and now this pregnancy you were correcta again. Very fun.

by Amy S. on The Nub Theory
It's a Boy!

It's a Boy! Thank you so much for keeping us excited!

by Tashayla L. on The Nub Theory
Thank you!!

I really wanted it to be a boy but your girl predictions helped me mentally prepare for the opposite. NIPT today confirmed it is a girl. Thank you for helping me bond with her from so early on.

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