Nub / skull theory ..... boy or girl

[Shelbustotherescue]

So I've been reading about the theories about whether it's a boy or girl ..... any one want to hazard a guess ? Just for fun / curiosity - I won't be finding out.

Scans at 9+6 and 10+6

Nub wise, I don’t think you can tell from those photos.. tends to be a bit clearer by 12 weeks but not always. Depends how baby is laying!

Skull theory I have no idea..

Thank you for replying - I have no idea where to look for the nub let alone know what it means