It is narrated from Sayyidah Umm al-Fadl (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) said: "One or two sucks, or drinking milk once or twice, do not establish the prohibition."
Muslim recorded it in his Sahih from the hadith of Ibn Abi Arubah and Hammad bin Salamah, from Qatadah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الرضاع / 15629