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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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could anyone tell me what they think im having please


Any guesses?

Sarah Glover

Any ideas please?

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.




This is the twelve wk scan of our fourth baby, after 3 boys we've been for gender scan today at 16 wksand this little one is a GIRL

Ivelisse Divine Reyes

Please help!! I can't tell.. Any guesses if it's a boy or a girl?


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??

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