I think we are all fascinated by the ability to be able to discern the sex of our baby before birth. The biggest question still lies within the validity of the answers to that question, "Is it a girl or a boy?"
The answer depends on many factors. From the machine being used, to the person reading it - the technology issues abound in the pregnancy sex determination debate. Is your ultrasound tech certified? Is the machine new or old? Is the machine a 2D or 3D ultrasound? When you add physical factors like the position of the baby or the gestational age of the baby you have a lot of variables.
Here is a fun quiz, designed to test your ultrasound knowledge: