The Diyah for a fetus; and the Diyah for accidental killing and the ambiguous killing must be paid by the shahiqilah of the killer — Sahih Muslim 1682 b

A woman killed her fellow-wife with a tent-pole. Her case was brought to Allah's Messenger (ﷺ), and he gave judgment that blood-wit should be paid by the relatives (of the offender) on the father's side. And as she was pregnant, he decided regarding her unborn child that a male or a female slave of good quality be given. Some of her offender's) relatives said: Should we make compensation for one who never ate, nor drank, nor made any noise, who was like a nonentity? Thereupon Allah's Messenger (ﷺ) said: He was talking rhymed phrases like the rhymed phrases of desert Arabs.