nub theory

(2 Posts)
noorey Sat 17-Apr-21 20:03:17

what is the basic trick of nub theory

OP’s posts: |
FoxyTheFox Sat 17-Apr-21 20:12:00

That a foetus of around 12wks has a 'nub' that will eventually turn into genitalia and if it points up then its likely a boy and if it points down then its likely a girl.

An experienced sonographer with a good view can accurately tell the sex of a c.12wk foetus with fairly good accuracy (around 75% if I remember rightly).

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