Since I am a sucker for knowing the Jellybean's gender ASAP I looked up the study information... Here is the link to the study: http://www.obgyn.net/ultrasound/ultrasound.asp?page=%2Ffm%2Farticles%2Ffetal_gender_placental_location
The gist, for those who don't want to wade through the whole study, is that in a study from 1997-2007 of over 5,000 pregnant women, it was found that:
97.2% of the male fetuses had a chorionic villi/placenta location on the right side of the uterus.
97.5% of female fetuses had a chorionic villi/placenta location to the left of the uterus.
Heres how you read the ultrasound:
If it was a Tansvaginal ultrasound (Actual result, not a mirror image)
If the location of the placenta is on the left of the uterus = girl
If the location of the placenta is on the right of the uterus = boy
If it was an Abdominal ultrasound (Must flip result because it is a mirror image)
If the location of the placenta is on the left of the uterus (must flip, its really on the right) = boy
If the location of the placenta is on the right of the uterus (must flip, its really on the left) = girl
Our Jellybean is on the left side in this Transvaginal Ultrasound which should mean GIRL??
I pulled out Brady's first Ultrasound picture (see Below), and it was correct for him. Looks like almost everyone who was polled the BabyCenter forum I found it on showed that this was correct for their past pregnancies. I'm not going to rely on it to determine gender for me for sure, but I thought it was an interesting theory nonetheless. It's a good way to pass the time. :)