Skull theory???!!!!

[JemAsh123]

I've posted a few pics asking for opinions on nub theory....
I've heard there's also a skull theory....
Any guesses? 🩷 or 🩵

Based on the skull theory that’s a girl.

It’s been right on all of mine but let’s be fair, it’s a 50/50 chance. Good odds.

Sharper, less round - skull theory says this is a Boy