Malik related to me that Yahya ibn Said said that he heard al-Qasim ibn Muhammad say, "A woman of the Ansar was married to Umar ibnal-Khattab. She bore Asim ibn Umar to him, and then he separated fromher. Umar came to Quba and found his son Asim playing in the courtyardof the mosque. He took him by the arm and placed him before him on hismount. The grandmother of the child saw him and argued with Umar aboutthe child so they went to Abu Bakr as-Siddiq. Umar said, 'My son.' Thewoman said, 'My son.' Abu Bakr said, 'Do not interfere between a childand its mother.' Umar did not repeat his words."Yahya saidthat he heard Malik say, "This is what I would have done in thatsituation."
USC-MSA web (English) reference: Book 37, Hadith 6
Arabic reference: Book 37, Hadith 1463