(51) باب الْقَدْرِ الَّذِي يُحَرِّمُ مِنَ الرَّضَاعَةِ .
Sa'eed narrated from Qatadah:
"We wrote to Ibrahim bin Yazid An-Nakha'i asking him about breast-feeding. He wrote back saying that Shuraih had narrated that 'Ali and Ibn Mas'ud used to say: 'A little or a lot of breast-feeding makes marriage prohibited.'" In his book, it said that Abu Ash-Sha'tha' Al-Muharibi narrated that 'Aishah had told him that the Prophet of Allah used to say: "Suckling (Al-Khatfah) once or twice does not make (marriage) prohibited."
Reference: Sunan an-Nasa'i 3311
In-book reference: Book 26, Hadith 116
English translation: Vol. 4, Book 26, Hadith 3313