The Skull Theory

"Such a fun, simple way to get clues of the gender!"
- Happy mama.

What is the Skull theory gender prediction?

As many other bone structures, the skull theory boy and the skull theory girl have certain characteristics that can help gender determination at an early gestational age. Although there isn’t much research on baby skull as it relates to gender determination to back this theory, there is research on the difference in skull structure in children and adults. Using the following markers is thought to be up to 92% accurate at determining gender from 10 weeks of gestation and beyond.

Skull theory examples

The Skull Theory

Skull theory gender guidelines

The Skull Theory

For Skull theory gender prediction, Baby Gender Pros uses the following guidelines:

A) The male cranial mass is more blockyand massive compared to the females, which is rounder and tapers at the top.

B) Temporal Ridge – this runs along the outer side of the upper skull creating the square shaped of the upper head. More prominent in men than women.

C) A woman’s supraorbital margin (the ridge above the eyes) is sharper, while the males is round and dull.

D) The Zygomatic bone (the cheekbone that lies under the lower eye ridge) is more pronounced on the male skull.

E) The Mandible (lower jaw) bone of a woman is rounded, while the male’s is squared.

F) Frontal bone forehead structure terminates at the brow. The male forehead is lower and more sloping.

G) Men have a deeper cranial mass.

H) The supercilary arch is large and pronounced in the man.

I) A males gonion (most posterior inferior point on angle of mandible) is more flared out and sharply angled.

J) The teeth of men tend to be larger.

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.


From 11 weeks

This early gender prediction theory focuses on the angle on the nub in comparison to the spine. It is sientifically proven and in controlled groups up to 98 to 100% accurate.

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The Skull Theory
Average rating:  
 41 reviews
by Teressa on The Skull Theory
Quick and fun.

Sent 13 week ultrasound for nub and skull theory, both predicted girl. 15 week ultrasound shows a baby girl, good job.

by lesly on The Skull Theory
Ramzi and Skull Theory

For both theories (Ramzi and Skull) you guessed girl. I was so excited to finally get my girl after two boys. Had a private ultrasound done to confirm, and the baby is a girl!. Very happy in the results here.

by Ashley on The Skull Theory
50% chance of being right!

This was a fun service: our little one was predicted to be a girl using two of the theories. Our baby girl was born just a few weeks ago 😉

by Heena on The Skull Theory
Did all 3 theories

U said girl and i found out this month it was right

by Isabella on The Skull Theory
Baby girl

Sent my Ramzi and skull theory and both said girl... confirmed at 14 weeks that I am expecting a baby girl 😍

by Jan on The Skull Theory
Correct prediction

Accurate result with skull

by Garcelle on The Skull Theory
Right skull and nub

I got the combined skull and nub theory was predicted boy and have had 3 scans confirm boy

by Lucie on The Skull Theory
Ramzi and Skull Theory

Both Ramzi and Skull theory have come back as boy! Gender scan is in 4 weeks so I am excited to see what little bean turns out to be!! 🤩

by Mdk on The Skull Theory
Ramzi nub skull theorie

Both theories predicted a girl. I have the results from the NIPT and it’s a girl !! So happy

by Lauren on The Skull Theory

You guys were right for me for skull theory. We found out today I am having a girl:)

by Nicola on The Skull Theory
Fun but not correct

For a bit of fun it was interesting to see their thoughts. I was predicted girl on both Ramzi and Skull theory. Had it confirmed a boy though! Don’t mind either way and it was just for a bit of fun! Would still recommend but take with a pinch of salt!

by Shari on The Skull Theory
It said both

The ramzi theory said boy and the skull and nub theory say girl. Guess we will find out on his/her birthday, won’t be confirming by ultrasound. .

by Ambrea on The Skull Theory
Nub and Skull theory

Ok, you predict I'm having a girl. We'll see when my blood test comes in. I'll let you know if you were right! 😊

by Em on The Skull Theory

Great service! Very happy to find you ❤️

by Sonya on The Skull Theory
You guessed a boy

I sent my 14 week scan and you said it was a boy by the skull theory, I’ve just had a gender scan at 16 weeks and it’s a BOY!l

by Sophie on The Skull Theory
It said both

I sent my scan of 6 weeks for the Ramzi method which said girl however since then I sent my 12 week scan in for the skull and nub theory which said boy.

by Julia on The Skull Theory
Baby girl

Had a 20 weeks scan today and you were absolutely right I am having a baby girl 🙏❤️Thanks

by Leah on The Skull Theory
They were right

Sent in a 12w ultrasound pic they guessed a girl a week later the dr confirmed

by Happy Mommy on The Skull Theory

Submitted my 12wk ultrasound. Skull theory was correct

by Bea on The Skull Theory

Gender pros said it was a boy but we are blessed with a baby boyl did the maternity 21 blood work said it’s a boy

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