Advanced search

Pregnant? See how your baby develops, your body changes, and what you can expect during each week of your pregnancy with the Mumsnet Pregnancy Calendar.

Nub theory

(4 Posts)
ew1990 Thu 04-May-17 22:30:12

Can someone please explain the nub theory to me please xx

ew1990 Fri 05-May-17 16:43:32


Zaberwocky Sat 06-May-17 12:43:43

Well now you've got me wondering too grin

MotherofBoy Fri 12-May-17 08:21:13

On 12 weeks scans you can sometimes see a genital nub. It will be at the base of the spine. So it depends on scan angle as legs often in the way! If the genital nub is parallel to the spine then the foetus is female. If the genital nub points slightly upwards at around a 30-45 degree angle the foetus is male. This is an accurate way that sonographers determine gender - my mum is a retired ob-gyn and she says it is a real theory!

Join the discussion

Registering is free, easy, and means you can join in the discussion, watch threads, get discounts, win prizes and lots more.

Register now »

Already registered? Log in with: