can you explain....

[MiasMum]

Can anyone explain how nub and skull theories work?

Many thanks x

 

[Misscalais]

Here's some pics, too blurry to read but around 12-13 weeks bub has a 'nub' boy bubs are in the blue, girls in the pink on the picture.

 

[Misscalais]

Skull theory. So generally you can take a guess on the 'profile' pics of bubs skull.