It is narrated from Sayyidah Umm al-Fadl (may Allah be pleased with her) that a man said: "O Messenger of Allah, I had a wife, and I married another in addition to her. Then the first wife claimed that she had breastfed the new wife." The Messenger of Allah (peace and blessings be upon him) said: "One or two small sucklings do not establish the prohibition (of marriage)."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21489