We had our ultrasound at 18 weeks and were hoping to find out whether Eli would be a big brother or big sister. The baby wasn't really cooperating while the tech was doing all the measurements. In an effort to get a better look at the primary area of interest, she had Ann lay all the way back, then she had her roll to her left side, then to her right side. She even had Ann try this pose.
Despite these measures, the ultrasound tech could only give us 90% certainty that it's a girl!
ps - we are 100% sure that Eli will be a great big brother!