Allah's Apostle gave the judgment that a male or female slave should be given in Qisas for an abortion case of a woman from the tribe of Bani Lihyan (as blood money for the fetus) but the lady on whom the penalty had been imposed died, so the Prophets ordered that her property be inherited by her offspring and her husband and that the penalty be paid by her Asaba.
:Hadith—Sahih al-Bukhari 8.732, Narrated Abu Hurairah

Umar bin Al-Khattab asked (the people) about the Imlas of a woman, i.e., a woman who has an abortion because of having been beaten on her abdomen, saying, "Who among you has heard anything about it from the Prophet?" I said, "I did." He said, "What is that?" I said, "I heard the Prophet saying, 'Its Diya (blood money) is either a male or a female slave.'" Umar said, "Do not leave till you present witness in support of your statement." So I went out, and found Muhammad bin Maslama. I brought him, and he bore witness with me that he had heard the Prophet saying, "Its Diya (blood money) is either a male slave or a female slave."
:Hadith—Sahih Bukhari 9.420, Narrated Mughira ibn Shu'ba

Ibn Abbas said: "Umar asked about the decision of the Prophet (peace be upon him) about that (i.e. abortion) Haml ibn Malik ibn an-Nabighah got up and said: I was between two women. One of them struck another with a tent-pole killing both her and what was in her womb. So the Apostle of Allah (peace be upon him) gave judgment that the blood-wit for the unborn child should be a male or a female slave of the best quality and that she should be killed."
:Hadith—Abu Dawood 4555, Narrated Umar ibn al-Khattab