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Can you tell if your baby is a boy or girl from just 12 weeks? We've all heard of the old wives tales like carrying your baby bump low means it's a boy or if you're craving sweet things, you're expecting a girl.

However, the nub theory claims to be a lot more accurate - and says you can even tell the sex of your baby just by looking at your 12 week ultrasound picture.

What is nub theory?

Between 11-13 weeks, all babies are said to have a 'nub' between their legs, and the angle of the nub will indicate whether it's a boy or girl.

It's said that if the nub is over 30 degrees up, it's a boy - but if it's under that then it's a girl. See our pictures below as an example.


Nub theory - girl picture

Girl nub: The nub isn't pointing up more than 30 degrees - in fact it's almost horizontal!

Nub theory - boy picture

Boy nub: The nub is at a much steeper angle upwards, indicating that this baby is a boy.

Going for your scan soon? You'll have to hope for co-operation from your baby - but if you can get a picture of them laying down on their side, that should provide you with a good view of the nub. 

More boy or girl predictors

- Chinese birth predictor
- Boy or girl quiz

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Christina Jones-Jenkins

Looks girly

Christina Jones-Jenkins

Looks boyish

Christina Jones-Jenkins

First pic looks boy...second pic looks like mine girly. Im gona guess boy!


Can anyone tell if they think we are having a boy or girl, please? Thanks


Any ideas? Boy or girl?!


Any ideas? Boy or girl?

Christina Jones-Jenkins

Not letting me c thr pic


Any guessers on my 11 week nub shot?


can anyone guess if its a girl or boy, this scan is at 13 weeks


any idea of what my baby is this is at 13 weeks

Kursty Marie Cunniff

Got 2 boys already

Kursty Marie Cunniff

13weeks 5days

Kursty Marie Cunniff

Any ideas 13week 5 days thanks Kirsty




Any guesses if the gender is boy or girl, please??


Leave a message...


Im not sure wot to think, i dont know what my scan pics looks more like. Its hard to tell Lets wait and see ha.


Boy or Girl???

elisa douglas

Hi was wondering if anyone has any ideas what we could be having? as i don't have a clue lol thank you :)

elisa douglas

Hi was wondering if anyone has any ideas what we could be having? thank you :)

миша кохт

babyy gender determination before birth and conception. Baby gender determination by photo of parents only. To do this I have an account and a group on Facebook. The group is called Baby gender by parents photo


Hi I know what I think it is, what do u think girl or boy, seems clear xx


Any ideas boy or girl?


please guess, boy or girl?


Please help - This is 12 weeks scan of my baby. Please guess the gender.


Hospital have said its a girl :)


At 20 week scan the hospital says it is a girl :)


Defo a girl I would say - it looks like my scan which is a girl!




Would you say boy or girl please? im 12 weeks 3 days :)

beth x

boy or girl guys????


i seen this in my last ultrasound at 11 weeks and 5 days. im confused?? not sure if its a penis or a nub?


I'd say a girl. I have two girls.


Hi any ideas on whether my scan is showing a boy or a girl ? Thanks


is the nub were im pointing to?


Hiya people any ideas on boy or girl. Many thanks


It's not allowing me to put a picture up anyone know why many thanks.


That looks like a girl to me it's the same as my first baby.xx


Cheers thanks! Any more thoughts on todays scan at 15 weeks??


could anyone tell me what they think im having please


Any guesses?

Sarah Glover

Any ideas please?

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