Is it true that medicine can determine the sex of the fetus?

The questioner : May Allah reward you. I mean, those who say they know what is in the womb, whether it is a boy or a girl, is their statement correct? And if it is correct, how do they know?

The Shaykh : Yes, it is correct. Knowledge now is through very precise rays that penetrate with great force, so they see the fetus; they see the fetus just as they see external appearances. Then the angel in charge of wombs says , and Allah says, "Male" or "Female," so he becomes aware of that. Yes.