Ramzi theory is where if you can see in your scan which side of your uterus the placenta has implanted on, it will strongly indicate whether it's a boy or girl. Apparently it needs to be from a very early scan, sometime between 6-8 weeks. I don't think the placenta is visible with everyones scan so it wouldn't work for everyone (if it works). I can clearly see both placentas on my 7+3 scan, my sisters you couldn't see at all (but turned out hers was anterior - in front of her uterus). There's even a website where you can submit your scan and they will tell you, they then ask you to report back after the birth to confirm whether they were right or not. There's also some confusion over how to tell what side your placenta is on because some scans are mirrored and some aren't. So if your positive of which side is which on your scan, then basically if your placenta is on the right, it's a boy...if it's on the left, it's a girl. My scan was trans abdominal and if I hold it in front me facing out (like I'm holding a pair of pants in front of me to see how they look), then that's how it looks from inside. If I'd had the vaginal scan it would be the opposite. I've only heard about it in the last few days so was curious to know if anyone here had tried it in previous pregnancies...sorry for the novel!