Can they just do a test to find out babies true sex?
Medicine cannot determine the baby’s “true sex.” For example, chromosomes do not necessarily dictate one’s gender identity, as it is obvious from the fact that most people born with androgen insensitivity syndrome live as women despite having XY chromosomes. In other words: science can measure how large a clitoris is, but cannot conclude how large or small it needs to be. That is a societal determination.