(1) باب فِي الْقَدَرِ
Narrated Anas bin Malik:
The Prophet (ﷺ) said, "Allah puts an angel in charge of the uterus and the angel says, 'O Lord, (it is) semen! O Lord, (it is now ) a clot! O Lord, (it is now) a piece of flesh.' And then, if Allah wishes to complete its creation, the angel asks, 'O Lord, (will it be) a male or a female? A wretched (an evil doer) or a blessed (doer of good)? How much will his provisions be? What will his age be?' So all that is written while the creature is still in the mother's womb."
Reference: Sahih al-Bukhari 6595
In-book reference: Book 82, Hadith 2
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 77, Hadith 594