Volume 4, Book 55, Number 550:
Narrated Anas bin Malik:
The Prophet said, “Allah has appointed an angel in the womb, and the angel says, ‘O Lord! A drop
of discharge (i.e. of semen), O Lord! a clot, O Lord! a piece of flesh.’ And then, if Allah wishes to com –
plete the child’s creation, the angel will say. ‘O Lord! A male or a female? O Lord! wretched or
blessed (in religion)? What will his livelihood be? What will his age be?’ The angel writes all this
while the child is in the womb of its mother.”