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"
SahihSahihSahih MuslimBook 26 · Hadith 113