Ubayd bin Nudaylah (may Allah have mercy on him) narrates from Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him), who said: A man from the tribe of Hudhayl had two wives. One of them struck the other with a stone or a tent pole, causing her to miscarry. The matter was brought to the Prophet (peace and blessings be upon him), and the Prophet (peace and blessings be upon him) gave judgment in it of a slave (ghurrah). The woman's heirs said: "How can we pay compensation for one who neither cried out nor wailed, neither drank nor ate? Such a thing should simply go unrequited." The Prophet (peace and blessings be upon him) said: "Is this rhymed speech like the rhymed speech of the Bedouins?" And he (peace and blessings be upon him) made the compensation for the child binding upon the heirs of the woman (who struck).
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 18103