Allah's Messenger (ﷺ) said, "The keys of the Unseen are five: Verily, Allah! With Him (Alone) is the knowledge of the Hour, He sends down the rain, and knows that which is in the wombs. No person knows what he will earn tomorrow, and no person knows in what land he will die. Verily, Allah is All-Knower, All-Aware." (V.31:34). [Sahih Al-Bukhari, 6/4627 So how can we combine between the fact that Allah عز وجل says He knows the sex of the fetus ( male or female ) and the fact that doctors can know the sex of the fetus while in the womb ?