When I had my ultrasound last year, the baby was asleep and the tech couldn't see much of anything. She suggested that when we come back two weeks later that I drink a caffeinated Coke just before the ultrasound. I thought this strange as I know that caffeine isn't so great when you are pregnant. However, she told me that it wouldn't hurt the baby at all, especially since it was a one time thing. Apparently the sugar and caffeine kept the baby awake and we were able to tell that it was a girl. Now we have a sweet little 6 month old. Hope the advice helps, as it did for us!