Silsilat al-Ahadith al-Sahihah

Sayyida Umm al-Fadl (may Allah be pleased with her) says: A Bedouin came to the Prophet (peace and blessings of Allah be upon him) while he was at my house. He said: O Messenger of Allah! I had a wife, and I married another woman. Now my former wife thinks that she may have breastfed my new wife once or twice. (What should I do now?) The Prophet (peace and blessings of Allah be upon him) said: "Breastfeeding once or twice does not make (relationships) unlawful."