The custom of killing their daughters was rampant among the Banu Tamim and the Quraish. They took pride in killing their daughters and it was for them a status symbol. This heartlessness reached such a height in some tribes that when the daughter became five or six years old and start uttering sweet words, the stone-hearted father would take her in beautiful garments to a place outside his settlement where he had already dug a deep ditch. He would make his daughter stand beside the ditch and then push her into the ditch stoning her to death while she called for her father’s help. No screaming and crying could melt his heart and he would return after filling the ditch. They took pride in burying their daughters alive. Qais bin ‘Āsim, a man from Banu Tamim, buried his ten daughters alive in this manner. Although no tribe of Arabia was free from this inhuman custom, some tribes did it more than others.
Source: The History of Islam, Volume 1 by Akbar Shah Najeebabadi, revised by Safi-ur-Rahman Mubarakpuri, darussalam, 1/76-77