I've heard of this theory, it's intriguing...not sure if I believe it or not yet!
I'm pretty sure the placenta w/this baby is on the right, that with several other "old wives tale" gender predictors had me REALLY thinking I was having another BOY this time around...we had an elective scan at 16wks and THAT tech said it was a boy (99% sure)...BUT, I didnt think the elective tech seemed very "good"...so I posted the video of it 2 days ago on this site and 2 techs and the overwhelming majority of other people who commented were SURE it's a baby GIRL I'm carrying!
SO I HAVE NO CLUE! HA! I'm anxious for my 21 wk anatomy scan to see if the placenta theory hold true or false for me! =)
I'm very interested to hear what other people and THE TECHS on this site think of the theory!