Musannaf Ibn Abi Shayba 9:1153

'Abdah narrated to us, from Hisham ibn 'Urwah, from Yahya ibn 'Abd al-Rahman ibn Hatib, from his grandfather: That he asked Umm Salamah about breastfeeding. She said: "There is no breastfeeding except that which is in the cradle, before weaning."