I can't quite get my head around the skull theory!

But I am having my 20 week scan Monday and I just wondered what you all think, I have been for a scan already to find out the sex but I'm not quite sure whether to believe them!

What do you guys think?

I will post on here after my scan to confirm who was right or wrong haha☺️

These were my 12 week scan photos! ^^

And this was at 17 weeks, she gave us awful photos as she didn't have one and the whole apt was taken up by trying to find out the sex.

What do you all think??