Additionally, due to the nature of the changing census questions from year to year, certain data points could appear to be discontinuous across time. For example, prior to 1940, census enumerators only recorded data about white and non-white populations. After 1940, more demographic categories were reported.
It is illegal for an employer, employment agency or union to take into account a person's race, color, religion, sex (including gender identity, sexual orientation, and pregnancy), national origin, age (40 or older), disability or genetic information when making decisions about job referrals.
The second is a curiosity application for the parents who would like to know the gender of the baby. This webpage explains in details how and when you can do the non-invasive prenatal gender test.