In some countries, parents want to know if the baby is a boy or a girl, as soon as possible. In other countries, parents prefer to wait until the birth.
My wife suggested that it is due to the language. In both Hebrew and Spanish (so I have been told) a baby is masculine and feminine, not neutral, whereas in English a baby can be either masculine or feminine. Therefore, this might explain why in Israel and Argentina parents want to know the gender as soon as possible, so as to know how to "think" of the baby, i.e. boy or girl, while here it is often less urgent.
With me, I was just impatient, and wanted to know everything possible, including the gender of our children.