Well, as far as a pregnant woman having ultrasound and that making her babies left handed....I had many sonograms while pregnant with my two right handed children. With my son, I had sonograms every other week for 6 months. I had been in a car accident and broken my back. The repeated tests showed where he was in relation to the break that could not be treated without aborting him. With the aid of a chiropractor and physically manipulating the position of my womb to move him off the tender area, I was able to carry him to full term and deliver by c-section. He and I were definitely both subjected to alot of waves!