Skull theory???

Raeshelle • Devoted Wife and Mother! Mike, Kash and Baby to be ❤️ girl🎀 or boy💙 4ish weeks until we find out.
Has anyone else been looking into  this?? I've been reading up on this theory and find it to be very interesting (obviously just for fun 😊)   It says that boys have larger blockier foreheads, while girls heads are rounder. 
Top ultrasound picture is of my son, and bottom is baby #2 (surprise) I can see a little difference. What do you ladies think? 🎀💙
2ish weeks until baby is born ❤️❤️