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 1681 a
Translation
Abu Huraira reported that among two women of the tribe of Hudhail one flung a stone upon the other causing an abortion to her so Allah's Apostle (may peace he upon him) gave judgment that a male or a female slave of best quality be given as compensation.