(51) باب الْقَدْرِ الَّذِي يُحَرِّمُ مِنَ الرَّضَاعَةِ .
It was narrated from Umm Fadl that the Prophet of Allah was asked about breast-feeding and said:
"Suckling (Al-Imlajah) once or twice does not make (marriage) prohibited." And (one of the narrators) Qatadah said (in his narration): "Suckling (Al-Massah) once or twice does not make (marriage) prohibited."
Reference: Sunan an-Nasa'i 3308
In-book reference: Book 26, Hadith 113
English translation: Vol. 4, Book 26, Hadith 3310