Narrated Abu Huraira: Two ladies (had a fight) and one of them hit the other with a stone on the `Abdomen and caused her to abort. The Prophet judged that the victim be given either a slave or a female slave (as blood-money).
Hadith Referenceصحيح البخاري / كتاب الطب / 5759
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة
And with the same chain (it is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him) that among the women of the tribe of Huzail, one struck the other, causing her to give birth to a stillborn child. Then the Messenger of Allah, peace and blessings be upon him, gave the ruling regarding this that a slave man or slave woman (should be given by the one who struck, as compensation and blood money).
Hafiz Zubair Ali Zai
Hadith Authentication: [وأخرجه البخاري 5759، ومسلم 1681 من حديث مالك به]
Jurisprudential Explanation: ➊ Rabi’ah ibn Abi Abd al-Rahman al-Ra’i used to say that the blood money (diyah) for the unborn child of a slave woman (who dies) should be the value of a male or female slave, which is fifty dinars or six hundred dirhams, and the blood money for a free Muslim woman is five hundred dinars or six thousand dirhams. See: [موطأ امام مالك رواية يحييٰ 856/2 ح 1660، وسنده صحيح] ➋ Some scholars say that if in such a situation the child is born alive and then dies, then the full blood money (diyah) must be paid. ➌ Some scholars have said that these two women who fought with each other were co-wives (each other's co-wives).
Source: Muwatta Imam Malik (Narration of Ibn al-Qasim): Commentary by Zubair Ali Zai, Page: 25